1.) They're typically made up of three main parts:protons,neutrons and electrons. ...The electrons orbit this nucleus,like planets.

2.) Atoms are made up of particles called protons,neutrons and electrons,which are responsible for the mass and charge of atoms.

3.) No.Two atoms of the same chemical element are typically not identical.First of all, there is a range of possible states that the electrons of an atom can occupy.Two atoms of the same element can be different if their electrons are in different states.

4.) Electrons contribute greatly to the atom's charge,as each electron has a negative charge equal to the positive charge of a proton.Scientists define these charge as "+1" and "-1".In an uncharge,neutral atom,the number of electrons orbiting the nucleus is equal to the number of protons inside the nucleus.

5.) Isotopes are variants of a particular chemical elements which differ in neutron number,and consequently in nucleon number.All isotopes of a given element have the same number of protona but different numbers of neutrons in each atom.

SANA MAKATULONG