Question

1.
0.4 Name or state the following.
[5]
The three isotopes of hydrogen.
2. Two elements having same number of protons and electrons but different number of neutrons.
3. The valency of an element whose electronic configuration is 2,8, 3.
The shell closest to the nucleus of an atom.
An element having valency 'zero'.
4.
5.
Q.5 At. no.1; Mass no.1 At. no.8; Mass no.16 At. no.7; Mass no.14 At. no.11; Mass no.23|At. no.17; Mass no.35 [5]
A
B
C
D
E
State the number of neutrons in each of the atoms A to E. Also state which of the atoms A to E is a metal.​

Answer 1

Answer:

Hi, how r u

Explanation:

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