Atom and Molecules
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Atom and Molecules: An atom is the smallest particles of an element that can take part in any chemical reaction,  the ancient Greeks were the first to use the word atom.

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Molecules atoms cannot exist alone. They generally bond with other atoms to form molecules that we can then say Molecule is formed when two or more atoms are chemically combined together.

Atom and Molecules: There are natural phenomena that support the statement that matter is made up of particles. Which are

  1. Diffusion
  2. Evaporation
  3. Osmosis
  4. Brownian Motion
  5. Sublimation

Objective question to check out for

1. An element with atomic number twelve is likely to be

electrovalent with a valency of 1

electrovalent with a valency of 2 answer

covalent with the valency of 2

covalent with the valency of 1


2. There are basic particles from which matter could be made exist

salts Answer





3. 3NH3 is3 moles of ammonium

3 moles of ammonia Answer

6 moles of ammonia

6 moles of ammonium


4. The atomic number of two Element X and Y are 12 and 9 respectively. The bond in the compound formed between the atoms of these two Element is

Ionic bond Answer



co- ordinate


5. An isotope has an atomic number of 17 and a mass number of 36. Which of the following gives the correct number of neutrons and protons in an atom of the isotopes?

Neutrons       Protons

53             17

17              36

19              17        Answer

36              17


6. A metallic ion X2+ with an inert gas structure contains 18 electrons. How many protons are there in this ion?



16 Answer



7. The formula of the compound forms in a reaction between a trivalent metal M and a tetravalent non- metal X is



M4X3 Answer




Trivalent metal is M3 while tetravalent non metal is X4 been that

3                      4

M                    X

Metal will combine first before non metal, so it will be M4 X3


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