Question

What are the first 20 elements and their atomic number?

Answer 1

hey dear here is your answer

first 20 elements and their atomic number

1 ) hydrogen atomic number 1
2) helium an = 2
3) lithium. an = 3
4) beryllium. an= 4
5) boron. an= 5
6) carbon. an= 6
7) nitrogen an =7
8) oxygen an= 8
9) Flourine. an =9
10) neon. an = 10
11) sodium an= 11
12) magnesium an=12
13 ) aluminum. an =13
14) silicon. an = 14
15) phosphorous. an =15
16 ) sulphur an = 16
17) chlorine. an= 17
18 )argon. an = 18
19) potassium an = 19
20) calcium. an = 20


hope helps u

Answer 2

i know the answer but ask brainly for the answer