The similarity in chemical behavior of elements in the same group of the periodi

Question

The similarity in chemical behavior of elements in the same group of the periodic table is best explained by the fact that atoms of these elements have: the same number of neutrons in the nucleus; the same number of protons in the nucleus; similar nuclear composition; the same number of valence electrons none of these A metal M forms two different chlorides, MCl_2 and MCl_3. The metal could be Fe Ha Al Na none of these An element has electronic configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2. Which element is group? Potassium nickel aluminum magnesium A pure substance X is heated and changes into two new substances, Y and Z information, we can deduce that X is a compound Y and Z are both elements X is an element and Y and Z are both compounds Which set of quantum numbers is not allowed: n = 1, l = 0, ml = 0, s = +1/2; n = 2, l = 1, ml = 1, s = -1/2; n = 3, l = 3, ml = -3, s = -1/2; n = 4, l = 0, ml = 0, s = +1/2;

Explanation / Answer

8 (d) Elements of the same group have same number of valence electrons and this property is responsible for similarity in chemical properties of elements of a group as the valence electrons participate in chemical reactions.

9. (a) Fe can form both FeCl2 and FeCl3 as the +2 and +3 states of Fe are common oxidation states.

10. (d) Magnesium 1s2 2s2 2p6 3s2 3p6 4s2 The atomic number of this element is 20. The outermost configuration is 4s2 . Hence, the element is from 2nd group. Mg also falls in this group.

11. (a) X on heating (decomposes) to Y and Z. So, we can say that X is a compound.

12. c) n =3 and l=3 is not allowed as n = 3rd shell cannot have f-orbital l =3; l cannot be equal to n

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