Question

Elements in the same periodic table have the same

a) number of electrons
b) number of neutrons
c) atomic number
d) number of outer electrons

Answer 1

D is the correct answer.

The trend that follows a group (vertical lines) is that they each contain the same number of valence (outer) electrons

Answer 2

The correct answer is option D.

Step-by-step explanation:

In modern periodic table, elements are arranged in increasing order of a their atomic numbers in 7 horizontal and 18 vertical columns.

Horizontal rows are known as periods.

In his periodic table, elements in the same periods has same number of principle quantum number or shells.

Vertical columns are known as groups:

In his periodic table, elements having similar properties lied in the same vertical columns or groups because all the elements had same number of valence electrons or outer electrons.