Question

The atomic number ofan elements 20
a)write the electronic configuration of an element and determine its value
b) write the formula of its chloride
c) is it more reactive or less reactive than MG give reason for your answer​

Answer 1

Answer:

The element is calcium(Ca)

(a)2,8,8,2 or 1s^{2} 2s^{2} 2p^{6} 3s^{2}3p^{6}4s^{2}1s

2

2s

2

2p

6

3s

2

3p

6

4s

2

(b)It is a metal

(c)CaCl_{2}CaCl

2

(d)calcium is more reactive than magnesium since it has another shell which means it's easier for calcium to lose electrons, in other words, calcium is more electropositive than magnesium

Answer 2

Answer:

(a) X(20)-2,8,8,2 Valence electrons- 2 Hence valency is

(b) It is a metal

(c) XCl2