Explanation:
1- Compared to the charge of proton the electron charge is negatively charged
An electron is a negatively charged subatomic particle which usually orbits the nucleus in discrete energy levels
2- the gold foil discovery led to the discovery of the nucleus
Ernst Rutherford performed the gold foil experiment where he suggest the atomic model of the atom. Here an atom is made up of small positively charged center where nearly all the mass is concentrated.
3- which particles are found in nucleus Protons and Neutrons
The nucleus of an atom is the center of the atom. It is here that the mass of an atom is concentrated. This is because the more massive subatomic particles of protons and neutrons are found here.
4- a vertical column in the periodic table are known as Group or family
The vertical column on the periodic table is known as the group. Down a group the energy level increases and the atoms becomes bigger.
5- the horizontal row on the periodic table are the Period
The horizontal column on the periodic table is the period.
