Chemistry
Assertion (A): Elements in the same vertical column have similar properties.
Reason (R): Properties depend upon the number of electrons in the valence shell.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Periodic Table
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation — Elements in the same vertical column i.e., a group in the periodic table, have the same number of valence electrons. Since chemical properties of elements depend upon the number of valence electrons, thus elements in the same group have similar properties. Hence, Reason (R) correctly explains the Assertion (A).
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Related Questions
Assertion (A): Hydrogen is placed in group I.
Reason (R): Hydrogen can gain an electron to achieve noble gas configuration.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Atomic size increases along a period.
Reason (R): Effective nuclear charge increases with atomic number.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
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.