F. DEFINE THE FOLLOWING : (1) Metal (ii) Non-metals (iii) Atom (iv) Molecule (v) Metalloid (vi) Compound (vii) Element (viii) Radioactive elements
Answers
i) Metals are opaque, lustrous elements that are good conductors of heat and electricity.
ii) In chemistry, a nonmetal (or non-metal) is a chemical element that is either a gas, liquid, or brittle solid in its most stable form, and which usually gains or shares electrons in chemical reactions.
iii) Atoms are made up of a nucleus, protons and electrons. Atoms consist of a nucleus made of protons and neutrons orbited by electrons.
iv) The smallest particle of a substance that has all of the physical and chemical properties of that substance. Molecules are made up of one or more.
v)A metalloid is an element that has properties that are intermediate between those of metals and nonmetals.
vi) Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio.
vii)Element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei.
viii)Radioactive elements are made up of atoms whose nuclei are unstable and give off atomic radiation as part of a process of attaining stability.