In the periodic table, the elements of a same group have the same:

1. Number of valence electrons
2. Mass number
3. Atomic number
4. Number of electrons

The number of elements in the largest period of the periodic table is:

1. 18
2. 8
3. 32
4. 42

Which of the following statements is correct with respect to the elements — Na, Mg, Al, Si, P, S and Cl.

1. Each element belongs to the same group.
2. Valency of each element is the same.
3. Each element belongs to the same period.
4. They are all metals.

Elements with 2 electrons in their outermost shells are known as :

1. Alkali metals
2. Halogens
3. Alkaline earth metals
4. Inert gases