Chemistry

2. chemical _______ may be defined as an attraction between the two atoms in a molecule
6. electrons present in the outer most orbit
9. atoms of the same elements having the same atomic number but different mass number
12. process that involves addition(gain) of electrons
13. _______ formula of the compound shows the smallest whole number of atoms of each element present.
14. branch of science that deals with the study of the nature of matter, its composition, occurrence, isolation, methods of preparation, properties and uses.
15. _______ number of an element is given by the total number of protons and neutrons present in the nucleus of an atom.
16. the smallest form of a chemical particle that retains the properties of the particle
17. elements belongs to groups 1A to 7A
20. ______metals are elements that belong to 1B to 8B

1. unit of measurement used in chemistry to express amounts of a chemical substance
3. process that involves removal(loss) of electron
4. type of bond is formed as a result of the complete transfer of one or more electrons from one atom to other
5. neutral particle
7. the central part of an atom consists of protons and neutrons
8. Electron ____ notation represents the distribution of valence electrons of an element
10. type of bond is formed by the mutual sharing of pair of electrons between two atoms each atom supplying equal number of electrons for sharing
11. positively charged particle
18. _____ number is the number protons present in the nucleus of an atom or number of electrons revolving around the nucleus in an atom
19. a negatively charged particle.
21. atoms of different elements having the same mass number but different atomic number.