What is orbit? eastern terai has more problem of flood and landslide why??​

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

There are main groups in the modern periodic table of elements

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride