Question

Which of the following statement is correct in regard to the classification of elements?
1---In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group
2----In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass
3----Elements in modern periodic table are arranged on the basis of increasing atomic masses
4-----Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers

Answer 1

Answer:

pls search on Google. Because I can't get the answer

Answer 2

Answer:

Explanation:

(i) Gold and Platinum occur in free state.

(ii) They are noble metals, hence they are least reactive.

(iii) They are not affected by air, water and other

natural factors.

(iv) Hence, pure gold and platinum always glitter.