Question

Find the periods and group of elements atomic number 1 to atomic number 21.​

Answer 1

Explanation:

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First 21 Elements of the Periodic Table

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Hydrogen

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Symbol: H

Atomic Number: 1

Atomic Mass: 1.008

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Helium

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Symbol: He

Atomic Number: 2

Atomic Mass: 4.003

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Created by

victoriaconlon17

Honors Chemistry

Terms in this set (21)

Hydrogen

Symbol: H

Atomic Number: 1

Atomic Mass: 1.008

Helium

Symbol: He

Atomic Number: 2

Atomic Mass: 4.003

Lithium

Symbol: Li

Atomic Number: 3

Atomic Mass: 6.941

Beryllium

Symbol: Be

Atomic Number: 4

Atomic Mass: 9.012

Boron

Symbol: B

Atomic Number: 5

Atomic Mass: 10.81

Carbon

Symbol: C

Atomic Number: 6

Atomic Mass: 12.01

Nitrogen

Symbol: N

Atomic Number: 7

Atomic Mass: 14.01

Oxygen

Symbol: O

Atomic Number: 8

Atomic Mass: 16.00

Fluorine

Symbol: F

Atomic Number: 9

Atomic Mass: 19.00

Neon

Symbol: Ne

Atomic Number: 10

Atomic Mass: 20.18

Answer 2

Answer:

atomic no. elements

1. hydrogen

2. helium

3. lithium

4. berrylium

5. boron

6. carbon

7. nitrogen

8. oxygen

9. florine

10. neon

11. sodium

12. magnesium

13. aluminium