Question

An element X has mass number 35 and number of neutrons 18.
a) Write the atomic number and electronic configuration of X.
b) Write its valency.
c) Write the formula of X with Mg.​

Answer 1

Answer:

1. atomic no is 17 2,8,7
2. valency is -1
3. MgX

Answer 2

Answer:

1. Atomic number is 17,2,8,7

2. Valency is -1

3. MgX