In 6th period……elements are representative.
a) 10
b) 12
c) 8
d) 17
6th period containing transition elements.……
a) 18
b) 16
c) 10
d) 36
In 7th period ………… elements are representative.
a) 10
b) 12
c) 8
d) 17
7th period containing transition elements.……
a) 18
b) 16
c) 10
d) 36
Actinides series is present in ………. period.
a) 5th
b) 6th
c) 3rd
d) 7th
Explanation:The actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. The actinoid series derives its name from the first element in the series, actinium.
Metallic properties tend to …….. across each period.
a) increase
b) decrease
c) remains same
d) none of these
