Chemistry Middle School

how many elements did mendeleev find from the periodic table?

Answers

Answer 1

Answer:

In the game, cards are arranged both by suit, horizontally, and by number, vertically. To put some order into his study of chemical elements, Mendeleev made up a set of cards, one for each of the 63 elements known at the time. Mendeleev wrote the atomic weight and the properties of each element on a card.

Explanation:

Related Questions

Which law is represented in the description that follows:

A baseball applies a force on a baseball bat an the baseball bat applies the equal force on the ball.

1st Law of Motion
2nd Law of Motion
Or
3rd Law of Motion

Answers

It’s the third law of motion
Explanation: The Third law is n. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

Answer:

biraz naruto izle

Explanation:

What is the acceleration, in m/s2, of a 50 kg object pushed with a force of 125 N?

Answers

Force 125 is the answer to this
GREETINGS!_____________________________________Answer:

2.5 m/s2

_____________________________________

By the second newtons law of motion,

                                   F = ma

Rearrange the formula,

                                  a = F/m

Substituing the values,

                                  a = 125/50

By Simplifying,

                                  a = 2.5 m/s2

_____________________________________HOPE IT HELPS!

At which stage is glucose broken into smaller molecules? before cellular respiration begins during the first stage of cellular respiration during the second stage of cellular respiration at the end of cellular respiration

Answers

Answer:

b

Explanation:

Answer:

its b

Explanation:

What kind of bond is formed between a metal and a nonmetal? Explain your answer.

Answers

Answer:

NVIDIA GeForce RTX 3080 10GB GDDR6X PCI Express 4.0 Graphics Card

Explanation:

Answer:

Ionic Bonds

Explanation:

Ionic Bonds - A bond between metal and nonmetal elements. Involves transferring electrons. Covalent Bonds - Also known as molecular bonds. A bond between two nonmetals.

Hope this helps

2. please answer i really need this and the answer is not 8

Answers

10 because you ha who multiply the Al2(S04) first :)

How does radiation differ from convection? (104 points)
a Radiation can move through empty space to transfer heat; convection cannot.

b Radiation needs a medium in order for heat to transfer; convection does not.

c Radiation requires objects to have direct physical contact; convection does not.

d Radiation transmits heat by circulating particles in an object; convection does not.

Answers

the answer is a :)
why? bc it is. yup.

HELP MEPLEASE SOMEONE REALLY REALLY REALLY SMART PLEASE
What is the mass of an atom with seven protons, seven neutrons, and eight electrons?
EXPLAIN:

Answers

Explanation: The atom is a nitrogen atom  and the mass of the atom is 14.0067 u.

Explanation: The atom is a nitrogen atom and the mass of the atom is 14.0067 u.

What do the lines making a circle around the high-pressure area indicate?

(science grade 6)

Answers

Answer:

Explanation:

areas of equal pressure.

They indicate areas of equal pressure

Choose all the objects which are true about the phases of the moon. (Hint: There are 4 correct answers.)
Group of answer choices

phases are the shapes that the moon appears to have during the course of the month

A half circle moon is called a quarter moon.

A new moon occurs when the moon is between Earth and the Sun.

A full moon occurs when Earth is between the sun and moon

a new moon occurs when Earth is between the moon and sun.

A full moon occurs when the moon is between the sun and Earth.

a lunar cycle is approximately 28 days between new and full moon..

a quarter moon is a crescent moon

Answers

The last answer is correct

What law of motion is represented in the description:

In order to get the child to go faster, her sister needed to push with a larger force.

1st law of motion
2nd law of motion
Or
3rd law of motion

Answers

I think it is 2nd law of motion
The correct answer is 2nd law of motion

The solid on the copper square after the experiment is called copper acetate. Write a word equation to represent what happened to substances in the experiment. Label the reactants and products in the equation.

Answers

Answer:

copper + acetic acid --> copper acetate

copper and acetic acid are reactants

copper acetate is the product

8. PLEASE ANSWER , LIKE ACTULLY ANSWER PLZ I AM GONNA FAIL PLZ ANSWER :,(

Answers

i’m almost sure it’s ug

What was the velocity over the entire trip?

A. -2
B. -1
C. 0
D. 1
E. 2

Answers

Answer:

D

Explanation:

Velocity =position divide by time

Maximum position is 12

Maximum time is 12

12/12=1

Which law is represented by the description:

The bottom domino is knocked out from a stack of dominoes when an outside force is applied.

1st Law of Motion
2nd Law of Motion
Or
3rd Law of Motion

Answers

Answer:

Si hay algo que sucedió entre ustedes raro o un comportamiento que tuviste con esa persona o que te vio hacer asi como le pudieron decir algo de ti que no le gustara a tu amigo hace que se comporte raro contigo

Explanation:

Cohesion of water molecules, giving water the ability to support forces pulling against the surface.


A. Cohesion

B. Surface tension

C. Adhesion

D. Capillary action

Answers

C. Adhesion i think

HELP! me please help with this science assignment

Answers

i’m not sure about the rest but 4 is families
ANSWER:
4. Group
5. Period
6. The purpose of the zigzag line is to help recognize which elements are metals, nonmetals, and which ones are metalloids.
7. For 7, you would just draw a copy of what thorium looks like on the periodic table. You can look it up and it will come up.
9. The nickel atomic nucleus contains 28 protons while the copper atomic nucleus contains 29 protons.
10. The chlorine atom contains 17 protons while sulfur has 16 protons. The chlorine atom has only one more proton than sulfur does, meaning no element can appear between sulfur chlorine because there cannot be half a proton.
HOPE THIS HELPS :)

What is not a physical property you can use to tell elements apart from other elements?
1. Melting point
2. Luster
3.Malleability
4. Toxicity
(PLEASE HELPP)

Answers

Answer:

I believe it is toxicity bc that isnt physical

which one is a balanced equation and an unbalanced equation? picture and equation are in the picture. thanks!

Answers

Answer:

The first is balanced and the second is unbalanced.

Explanation:

Hope I helped! Please mark Brainliest!

Answer: 1st is unbalanced 2 is balanced

Explanation:

HELP ASAP/ If both crossing over and independent assortment occur during meiosis, which type of cells will result?

four genetically identical cells
four genetically different cells
two genetically identical cells
two genetically different cells

Answers

Answer:

sorry i am a month late but your answer will be b

Explanation:

i did the unit test review and got the answer right

Answer:

I think B

Explanation:

Energy that is absorbed by the land and water is changed into


A.visible light

B.infrared radiation

C.Ultraviolet radiation

Answers

the answer is B. the energy is changed into heat energy which is also known as infrared radiation.

Answer:

it's heat energy it B I'm pretty sure I did this it was correct

Explanation:

BBBBBB

How does changing the Frequency ​affect the energy of the wave?

Answers

If the frequency of a wave increases, its energy will increase. While if the frequency of a wave decreases , its energy will decrease.


Hope this helps.



Please mark as brainliest...........

How many electrons does Sb have in the n = 3 energy level?

Answers

Answer:

The highest-numbered shell is the third shell, which has 2 electrons in the 3s subshell and 3 electrons in the 3p subshell.

Explanation:

The highest-numbered shell is the third shell.

Which choice best describes the Law of Conservation of Energy? Group of answer choices Energy is lost and cannot be recovered. Energy cannot be created or destroyed. Energy cannot be transformed. Once energy is used, it cannot be used again.

Answers

Energy can not be created nor destroyed
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