Science Quiz 2 on Atoms and Elements

complete

The difference between the mass number and the atomic number equals the number of…......

• Protons

• Neutrons

• Electrons

• Nucleons

write the scientific term

The element is necessary for the greening of plant leaves in NPK fertilizer.

• Potassium

• Phosphorus

• Nitrogen

• Sodium

The............... model is considered the first experimental model of the atom.

• Bohr

• Mendeleev

• Moseley

• Rutherford

Give Reasons for : the nucleus of an atom positively charged ?

In the nucleus of an atom, the number of neutrons is usually greater than or equal to the number of protons.

• true

• false

complete :

the element…...................... is necessary for the healthy growth of plants.

Give reason : The ratio of the mass of proton to the mass of a neutron equal one

complete :

Protons are …………………………….charged particles, while.............. are negatively charged particles that orbit the nucleus.

What happens when. ? The mass number equals the atomic number.

complete:

the symbol of sodium is ..................... while the symbol of sulphur is ............