The elements X, Y and Z belongs to the 3rd period of the modern periodic table having group number 1, 2 and 13 respectively. Which one of these has the a) Smallest atomic radius. Explain. b) Maximum chemical reactivity. Justify your answer.
Answers
(a) Al has the highest valency of 3. As it belongs to group IIIA, it has 3 electrons in its valence shell. So, its valency is 3.
(a) Al has the highest valency of 3. As it belongs to group IIIA, it has 3 electrons in its valence shell. So, its valency is 3. (b) Na has the largest atomic radius as the atomic radius decreases across the period.
(a) Al has the highest valency of 3. As it belongs to group IIIA, it has 3 electrons in its valence shell. So, its valency is 3. (b) Na has the largest atomic radius as the atomic radius decreases across the period.(c) As we move from left to right in a period the chemical reactivity of a metal decreases and of non-metal increases. Here given are metals and hence Na is most reactive as it is the first element of period 3.
Explanation:
ANSWER
(a) Al has the highest valency of 3. As it belongs to group IIIA, it has 3 electrons in its valence shell. So, its valency is 3.
(b) Na has the largest atomic radius as the atomic radius decreases across the period.
(c) As we move from left to right in a period the chemical reactivity of a metal decreases and of non-metal increases. Here given are metals and hence Na is most reactive as it is the first element of period 3.