periodic table elements 1-20

Question 1

H

Answer 1

atomic #-1
element: Hydrogen
Electric configuration-(1)
not a metal- gas

Question 2

He

Answer 2

atomic #- 2
element- helium
Electric config- (2)
not a metal- Nobel gas

Question 3

Li

Answer 3

atomic #- 3
element- Lithium
Electric config.- (2,1)
metal

Question 4

Be

Answer 4

atomic #- 4
element- Beryllium
Electric config.- (2,2)
metal

Question 5

B

Answer 5

atomic #- 5
element- Boron
Electric config.- (2,3)
metal

Question 6

C

Answer 6

atomic #- 6
element- Carbon
Electric config.- (2,4)

Question 7

N

Answer 7

atomic #- 7
element- Nitrogen
Electric config.- (2,5)

Question 8

O

Answer 8

atomic #- 8
element- Oxygen
Electric config.- (2,6)

Question 9

F

Answer 9

atomic #- 9
element- Fluorine
Electric config.- (2,7)

Question 10

Ne

Answer 10

atomic #- 10
element- Neon
Electric config.- (2,8)
Nobel gas

Question 11

Na

Answer 11

atomic #- 11
element- Sodium
Electric config.- (2,8,1)
metal

Question 12

Mg

Answer 12

atomic #- 12
element- Magnesium
Electric config.- (2,8,2)
metal

Question 13

Al

Answer 13

atomic #- 13
element- Aluminum
Electric config.- (2,8,3)
metal

Question 14

Si

Answer 14

atomic #-14
element- Silicon
Electric config.- (2,8,4)

Question 15

P

Answer 15

atomic #- 15
element- Phosphorous
Electric config.- (2,8,5)

Question 16

S

Answer 16

atomic #- 16
element- Sulphur
Electric config.- (2,8,6)

Question 17

Cl

Answer 17

atomic #-17
element- Chlorine
Electric config.- (2,8,7)

Question 18

Ar

Answer 18

atomic #- 18
element- Argon
Electric config.- (2,8,8)
Nobel gas

Question 19

K

Answer 19

atomic #- 19
element- Potassium
Electric config.- (2,8,8,1)
metal

Question 20

Ca

Answer 20

atomic #- 20
element- Calcium
Electric config.- (2,8,8,2)
metal

Question 21

What makes He, Ne and Ar different from the rest of elements

Answer 21

They all have completely filled valence shells. Thus they are stable, unreactive and called Noble gases

Question 22

What is a metal?

Answer 22

An element that has 1,2,3 valence electrons except hydrogen and helium

Question 23

What is a non-metal?

Answer 23

A non-metal has 4+ valence electrons

Question 24

What are metalloids?

Answer 24

Some elements are referred to as semi metals or metalloids which show the properties in-between metals and non-metals
Some metalloids are- Boron and Silicon