Chemistry
In Period 3 of the Periodic Table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the brackets to complete the following statements:
(i) The element B would have (lower/higher) metallic character than A.
(ii) The element A would probably have (lesser/higher) electron affinity than B.
(iii) The element A would have (greater/smaller) atomic size than B.
Periodic Table
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Answer
If the element are placed as B and then A in the 3rd period of the periodic table then
(i) The element B would have higher metallic character than A as metallic character decreases across a period.
(ii) The element A would probably have higher electron affinity than B as electron affinity increases across a period.
(iii) The element A would have smaller atomic size than B as atomic size decreases across a period.
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Related Questions
Fill in the blanks by selecting the correct word from the brackets :
(a) The element below sodium in the same group would be expected to have a …………… (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a (lower/higher) ionization potential than chlorine.
(b) On moving down a group, the number of valence electrons …………… (remains the same/increases/ decreases).
(c) Metals are good …………… (oxidising agent/ reducing agent) because they are electron …………… (acceptors/donors).
(d) Down the group, electron affinity …………… [increases, decreases, remains same].
(e) Electronegativity across the period …………… [increases/ decreases].
(f) Non-metallic character down the group …………… [increases/ decreases].
(g) In a period, increase in electron affinity increases …………… (oxidation/reduction).
(h) On descending a group, …………… (increase/decrease) in ionisation potential as well as electron affinity …………… (increases/decreases) oxidising capacity.
(i) If an element has a low ionization energy then it is likely to be …………… (metallic/non metallic).
(j) If an element has seven electrons in its outermost shell then it is likely to have the …………… (largest/smallest) atomic size among all the elements in the same period.
Rewrite the following sentences by using the correct symbol > (greater than) or < (less than) in the blanks given :
(i) The ionization potential of potassium is ………. that of sodium.
(ii) The electronegativity of iodine is ………. that of chlorine.
There are three elements E, F and G with atomic numbers 19, 8 and 17, respectively.
Classify the elements as metals and non-metals.
Arrange the following as per instructions given in the brackets.
(a) Mg, Cl, Na, S, Si (decreasing order of atomic size)
(b) Cs, Na, Li, K, Rb (increasing metallic character)
(c) Na, K, Cl, S, Si (increasing ionisation potential)
(d) Cl, F, Br, I (increasing electron affinity)
(e) Cs, Na, Li, K, Rb (decreasing electronegativity)
(f) K, Pb, Ca, Zn (increasing reactivity)
(g) Li, K, Na, H (decreasing order of their potential ionisation)