1Match each element symbol with its atomic number: H, Li, N, Al, P, Ne and 13, 15, 1, 10, 3, 7, 9.
2What is the central part of an atom called?
3Which sub-atomic particles are found in an atom?
4Which sub-atomic particles stay in the central part of an atom?
5What is the sub-atomic particle that keeps going round the central part of the atom called?
6An atom has 6 protons and 6 neutrons in its nucleus. Which element does this atom belong to?
7Using coloured thread or wire and different coloured beads, pulses or seeds, how would you build an atomic model of any five elements with atomic numbers from 1 to 20?
8Name two things that have mass and volume and two that have neither, and explain the difference.
9How much lighter is an electron than a proton? Give the number.
10The atomic number of chlorine is 17. Work out its electron arrangement.
11Using Bohr and Bury's \( 2n^2 \) rule, show the largest number of electrons the M shell can hold.
12What decides the chemical and physical properties of an element? Give the reason.