Electrons.

All in the blanks.

1. The atomic number of potassium is

19

Therefore there are

__protons in the

of the potassium atom. The symbol

of potassium is

Potassium has a mass of

It

2. Number 79 on the Periodic Table is

Its symbol is

is a

because the color of the box is green. It has a mass of -

3. There are

metalloids on the Periodic Table. They are called metalloids because

they have characteristics of both

and non-

4. On the Periodic Table of the Elements, the elements are classified into solids, liquids, and

In the individual boxes, the solids are written in

the liquids are written in _

and gases are

written in

1) Potassium's number of protons is 19

Symbol is K

Mass number is 39.1 u

2) Number 79 on periodic table is Gold

Symbol is Au,

Mass number is 196.97

3) Metals and non-metals

4) Gases

Iodine

Bromine

Fluorine, chlorine

Explanation:

The modern periodic table is the arrangement of atoms in an increasing atomic number.

The Russian chemist, Dmitri Mendeleev arraigned the elements as they appear in the modern periodic table.

It has 18 groups and 7 periods.

These groups belong to the specific classification of the elements.

The periods referred to as the horizontal rows on the periodic table have given much importance than the vertical columns for the actinides and lanthanides.

It is easy to identify the characteristics of the elements present in the modern periodic table.