i. Using Dobereiner’s law of triads, find the missing number. ii. In the Mendeleev’s periodic table, properties of elements

Question

Full in the blank:

i. Using Dobereiner’s law of triads, find the missing number.

ii. In the Mendeleev’s periodic table, properties of elements are periodic function of their ……..

iii. The vertical columns in the Mendeleev’s periodic table are called …….

iv. Eka-aluminium is called ……..

v. Zero group elements are called ……..

Answer 1

i. Using Dobereiner’s law or triads, the missing number is

ii. In the Mendeleev’s periodic table, properties of elements are periodic function of their atomic masses.

iii. The vertical columns in the Mendeleev’s periodic table are called groups.

iv. Eka-aluminium is called gallium

v. Zero group elements are called noble gases.