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Classification of Matter

Is boron, Pol...

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Is boron, Polonium and astatine metalloids?

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Q. (a) What are (i) metals (ii) non-metals, and (iii) metalloids ?

Give two examples each of metals, non-metals and metalloids.

(b) Classify the following into metals, non-metals and metalloids :

Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium

Q. The atomic number of astatine which belongs to the sixth period is:

Q. Astatine is the last element in halogen group

(V I I)

. It is expected to be:

Q. Which one of the following is not a metalloid ?
(a) boron
(b) silicon
(c) gallium
(d) germanium

B F_{3}

N F_{3}

are covalent compounds.

B F_{3}

is non-polar while

N F_{3}

is polar. The reason is that:

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