Name and symbol for the first 20 elements.

Name and symbol for the first 20 elements.​

2 months ago

Solution 1

Guest Guest #5492752
2 months ago

Answer:

H - Hydrogen

He - Helium

Li - Lithium

Be - Beryllium

B - Boron

C - Carbon

N - Nitrogen

O - Oxygen

F - Fluorine

Ne - Neon

Na - Sodium

Mg - Magnesium

Al - Aluminum

Si - Silicon

P - Phosphorus

S - Sulfur

Cl - Chlorine

Ar - Argon

K - Potassium

Ca - Calcium

Explanation:

Solution 2

Guest Guest #5492753
2 months ago

Answer:1 Hydrogen H

2 Helium He

3      Lithium Li

4 Beryllium Be

5 Boron B

6 Carbon C

7 Nitrogen N

8 Oxygen O

9 Fluorine F

10 Neon Ne

11 Sodium Na

12 Magnesium Mg

13 Aluminum Al

14 Silicon Si

15 Phosphorus P

16 Sulfur S

17 Chlorine Cl

18 Argon Ar

19 Potassium K

20 Calcium Ca

Explanation:

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If you could count two atoms every second, how long would it take you to count a mole of atoms? Assume that you counted continually 24 hours every day. How does the time you calculated compare with the age of Earth. which is estimated to be 4.5 x 10 years old?​
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If we count two atoms every seconds, then the time taken to count one mole of atoms that is 6.02×10²³ atoms is 3.0×10²³ seconds. If we continually count the atoms it will take the time which is longer that the age of earth.

What is one mole of atoms?

Any substance that contains 6.02×10²³ atoms is called its one mole. this number that is, one mole of an atom is called the Avogadro number.

The time for counting two atoms is one second then the time to count 6.02×10²³ atoms is 6.02×10²³ /2 = 3.0×10²³ seconds.

One year have about 31556926 seconds. 3.0×10²³ seconds comprises 3.0×10²³  /31556926 = 9.53×10¹⁵ years. Age of earth is 4.5 × 10⁹ years.

Therefore, it will take longer time to count one mole of atoms than the age of earth.

To learn more about mole of atoms, refer the link below:

brainly.com/question/20350064

#SPJ2

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It would take 9.54 x 10^15 years to count 1 mole of atoms which is 10^6 times the age of Earth.

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