Question

4. Match column A with column B
Column A
(a) Elements short by 1 electron in octet
(b) Highly reactive metals
(c) Non-reactive elements
(d) Elements of groups 3 to 12
(e) Radioactive elements
(f) Elements with 2 electrons in the outermost orbit
Column B
(i) Transition elements
(ii) Noble gases
(iii) Alkali metals
(iv) Alkaline earth metals
(v) Halogens
(vi) Actinides​

Answer 1

a) Elements short by 1 electron in octet

→ v) Halogens

★ Halogens are member of group 17 and lack 1 electron to complete their octet. Example : Fluorine, Chlorine, Bromine, Iodine

b) Highly reactive metals

→ iii) Alkali metals

★ Alkali metals are of group 1 and are highly reactive. Examples are Lithium, Sodium, Potassium.

c) Non - reactive metals

→ ii) Noble gases

★ Noble gases have their outermost shell completely fill thus they don't participate in reaction, or show least reactivity. Example Helium, Argon, Neon, Xenon etc

d) Elements of groups 3 to 12

→ i) Transition elements

★They lie in the middle of periodic table from group 3 to group 12.

e) Radioactive elements

→ vi) Actinides

★ All Actinides are radioactive. There are 14 of them, lying in group 3 from atomic number 90 till 103.

f) Elements with 2 electrons in the outermost orbit.

→ iv) Alkaline earth metals

★ They are group 2 elements having a valency of 2 and number of electrons in their outermost shell as 2.

Answer 2

Answer:

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Explanation: