Q17 (iv) What will be the formula of the compound formed between Al and F
(a) AIF
(b) AlF3
(c) AlzF
(d) AlzF2
017 (v) In third period, correct order of non-metallic character of few elements (Na, AI,
Mg, CI, S) in increasing order will be:
(a) Na < Mg <Al<S<cl
(b) Cl< Na<S<Al< Mg
(c) Na < Al<S< Mg < Cl
(d) Al <S< Cl< Na
Answers
Required Answers:
(IV) The valency of Aluminium and Fluorine are +3 and -1 respectively. Hence by criss-crossing, we will get the formula as : AlF3
Note:
- If a metal is present, always place it first in the formula. Like here, Aluminium is the metal
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(V) In the periodic table, we might have observed that the metals are towards the left side and non-metals are towards the left. It means, Non-metallic tendency increases going from left to right in the periodic table.
Because:
- Non-metallic character relates to the tendency to accept electrons during chemical reactions.
Then,
The correct sequence of increasing non-metallic character will be: Na < Mg < Al < S < Cl (A)
Answer:
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