Question

.Valence electrons of A, B and C are 8, 2 and 7 respectively. Identify (3)

a) The most reactive metal.

b) The most reactive nonmetal.

c) The element belongs to the alkaline earth metal family.

d) The element belongs to the noble gas family.

e) The element with valency zero.

f) Write the formula of the compound formed when B and C

react together.​

Answer 1

Answer:

1) element flourine

2) potassium

3)hydrogen, lithium, sodium, potassium, rubidium, caesium, Francium

4) helium, neon, argon, krypton, xenon, radon

5) group 18 elements

Answer 2

Answer:

a) Element B

b) Element C

c) Element B

d) Element A

e) Element A

f) BC₂

Explanation:

a) Metals have less valence electrons

b) Non- metals have more valence electrons, but less than 8

c) alkaline earth metal family elements has 2 valence electrons

d) noble gas family elements have 7 valence electrons

e) Noble gases have 0 valency even though they have 8 valence electrons,

f) Answer of f) is in the attachment

Note for f) : If we have valence electrons more than 4, Valency is given by the difference of 8 and number of valence electrons

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