Question

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Answer 1

LiF is composed of Li 2+ or F-

i. is mass of mg×mass of O

Answer 2

(i) Calculate the relative formula mass of MgO :-

Answer :-

Atomic Mass of Magnesium = 24 u

Atomic mass of Oxygen = 16 u

Relative Atomic mass of compound Magnesium Oxide will be as follows :-

$24 + 16 = 40 \: u$

$\rule{200}{2}$

(ii) Give the formula of the two ions in LiF

Answer :-

Lithium Floride is formed by two elements Lithium and Florine.

$\boxed{\mathtt{LITHIUM}}$

Atomic number is 3

Electronic configuration is as follows :-

2,1

Valency will be 1

$\boxed{\mathtt{FLORINE}}$

Atomic number is 9

Electronic configuration is as follows :-

2,7

Valency will be (-1)

So,

Two ions forming Lithium Floride are as follows :-

$Li^{+} \:and\: F^{-}$

$\rule{200}{2}$