Anyone know the answer to this? Explain if you do, im not sure if i understand what its asking.

1. Proton = 4

2. Neutron = 5

3. Electron = 2

Explanation:

9 4Be^2+

From the above, we obtained the following:

Atomic number = 4

Mass number = 9

Charge = +2

1. Determination of the proton.

Atomic number is simply defined as the proton number. This implies that:

Atomic number = proton number

Atomic number = 4

Therefore,

4 = proton number

Proton = 4

2. Determination of the Neutron.

Mass number = Proton + Neutron

Mass number = 9

Proton = 4

Neutron =?

Mass number = Proton + Neutron

9 = 4 + Neutron

Collect like terms

Neutron = 9 – 4

Neutron = 5

3. Determination of the electron.

From the question given

9 4Be^2+

The atom has a charge of +2. This implies that the atom has lose 2 electrons. Thus we can obtain the electron as follow:

Proton = 4

Charge = +2

Electron =?

Electron = Proton – charge

Electron = 4 – 2

Electron = 2

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