Question 2 which describes an atom with a negative net charge?
a
it contains more electrons than protons.
b
it contains more protons than electrons.
c
it contains more neutrons than protons.
d
it contains more neutrons than electrons.

B

It contains more protons than electrons.

A  It contains more electrons than protons.

Explanation:

An atom basically consists of three entities protons, electrons and neutrons.  

While protons and neutrons are present inside the nucleus and contributes to the total mass of the atom, electrons remain outside the nucleus and only contribute -1 charge per electron.

In an atom, a proton has +1 charge and mass equivalent to 1 a.m.u, a neutron has 0 charge and mass equivalent to 1 a.m.u  and an electron has -1 charge and 0 mass (negligible).

Atomic number of an atom = number of electrons in that atom = number of protons in that atom.

In a neutral atom, the number of electrons are equal to the number of protons so their positive and negative charges counter balance each other thereby making the atom neutral.

But, if an atom gains an electron from an atom of any other element then it will acquire a net negative charge.

For example, a chlorine atom (Cl) when gains an electron it becomes Cl⁻.

                          Cl + e⁻    →     Cl⁻

true

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