Question

Write the number of periods and groups in the Modern Periodic Table. How does the metallic character of elements vary on moving (i) from left to right in a period, and (ii) down a group? Give reason to justify your answer.

Answer 1

Answer:

Number of Periods: 7

Number of Groups: 18

Metallic character decreases along the period because effective nuclear charge increases on the valence electrons, hence decrease in tendency to lose electrons.

Metallic character increases down a group because effective nuclear charge experienced by valence electrons decrease, hence tendency to lose electron decreases.

Answer 2

Answer:

1. Ovary - Releases egg or female gamete / ovum releases oestrogen / female hormones

2. Oviduct - Transportation of ovum / egg from ovary to the uterus / site of fertilisation

3. Uterus - Development of embryo / foetus

Explanation: