An atom usually contains three main particles. Complete the following table. No Name of the particles Kind of charge each carries 1 2 3

An atom usually contains the following three main particles. No Name of the particles Kind of charge each carries 1 Electron negative charge An atom is made up of electrons. No Name of the particles Kind of charge each carries 2 Proton positive charge An atom is made up of protons. No Name of the particles Kind of charge each carries 3 Neutron neutral charge An atom is made up of neutrons. No Name of the particles Kind of charge each carries 1 Electron negative charge 2 Proton positive charge 3 Neutron neutral charge

The number of protons, neutrons and orbital electrons in particles A to D are given in the following table. Particle Protons Neutrons Electrons A 3 4 2 B 9 10 10 C 17 18 17 D 17 20 17 Choose from the table, which particles represent a cation, an anion, a pair of isotope.

Particle A is a cation because it contains more number of protons than electrons which means that the positive charge will increase, so it is called a cation. In a neutral atom number of protons will be equal to number of electrons. Particle B is an anion because it contains more number of electrons than protons which means that the negative charge will increase, so it is called an anion. In a neutral atom number of protons will be equal to number of electrons. Particles C and D are isotopes these particles are having same atomic number with different mass numbers that means they differ in the neutron number.

The number of protons, neutrons and orbital electrons in particles A to D are given in the following table Particle Protons Neutrons Electrons A 3 4 2 B 9 10 10 C 17 18 17 D 17 20 17 Write the chemical formula of the compound that would be formed between C and hydrogen.

The compound formed between C and hydrogen is hydrochloric acid and the chemical formula is HCl . Here particle C is chlorine it will react with hydrogen the resultant compound is HCl with the covalent bond.