(a) The table below compares some properties of metals and non-metals.Write down the missing statements (i) to (iv) :

$\begin{matrix} METALS & NON-METALS (i) . . . . . . . . . . . . & P o o r c o n d u c t o r s o f h e a t . (i i) M a l l e a b l e & . . . . . . . . . . . . (i i i) F o r m p o s i t i v e i o n s & . . . . . . . . . . . . . . . . . . . . . . . & F o r m a c i d i c o x i d e s . \end{matrix}$

(b) How many valence electrons are present in:

(i) metals and (ii) non-metals?

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Solution

(a)

Metals Non-metals

(i) Good conductors of heat
(ii) Malleable
(iii) Form positive ions
(iv) Form basic oxides

Poor conductors of heat
Non-Malleable
Forms negative ions
Form acidic oxides

(b) Valence electrons present in :
(i) Metals have 1, 2, 3, 4, 5 (Bismuth) and 6 (Polonium) valence electrons.
(ii) Non-metals have 4 (Carbon) 5, 6, 7, or 8(noble gases) valence electrons.

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Similar questions

Metal	Non-metal
(i) Malleable Form positive ions. (iv)	Poor conductors of heat (ii) (iii) Form acidic oxides

\begin{matrix} M e t a l s & N o n - m e t a l s (i) \dots \dots & P o o r c o n d u c t o r s o f h e a t (i i) M a l l e a b l e & \dots \dots (i i i) F o r m p o s i t i v e i o n s & \dots \dots (i v) \dots \dots & F o r m a c i d i c o x i d e s \end{matrix}

Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties.

Properties

Metals

Non-metals

1. Appearance

2. Hardness

3. Malleability

4. Ductility

5. Heat Conduction

6. Conduction of Electricity

\begin{matrix} Sl. & Element & Category & Exceptional Property 1. & Graphite (C) & Non-metal & Conducts electricity 2. & Magnesium (Mg) & Non-metal & Hardest natural substance 3. & Iodine (I) & Non-metal & Z 4. & Potassium (K) & Y & Soft (can be cut with knife) 5. & X & Metal & Low M.P. (melts in hand) \end{matrix}

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Metals	Non-metals
(i) Good conductors of heat (ii) Malleable (iii) Form positive ions (iv) Form basic oxides	Poor conductors of heat Non-Malleable Forms negative ions Form acidic oxides