____ is the smallest building block of all matter in nature and cannot be divided chemically.

a) Element

b) Molecule

c) Cube

d) Atom

2. A Substance in which all the atoms are of the same kind is called ______

a) Blocks

b) Pyramid

c) Element

d) Atom

3. Approximately how many elements are known to us?

a) 20

b) 30

c) More than 100

d) 50

4. What constitutes the nucleus of the atom?

a) Electron

b) Proton

c) Neutron

d) Proton and neutron

5. The charge on a proton is _____

a) Positive

b) Negative

c) Neutral

d) Both positive and Negative

6. The charge on Electron is _______

a) Positive

b) Negative

c) Neutral

d) Both positive and Negative