Question

for $^{4}_{2}he^{+2}$
the atomic number is 1 and there are are 2 protons.
the mass number is 3 and there are 4 nucleons.
there are 5 neutrons.
the charge is 6 and there are are 7 electrons.
this radiation is called 8.
a. alpha b. beta c. gamma d. 0 e. 1
f. 2 g. 3 h. 4 i. 5 j. 6

Explanation:

Step1: Identify atomic number

The sub - script in the nuclear notation represents the atomic number. For $^{4}_{2}He^{ + 2}$, the atomic number is 2.

Step2: Determine number of protons

The atomic number is equal to the number of protons. So, number of protons = 2.

Step3: Identify mass number

The mass number is the superscript in the nuclear notation. Here, mass number = 4.

Step4: Define nucleons

Nucleons are protons and neutrons. Mass number = number of nucleons, so number of nucleons = 4.

Step5: Calculate number of neutrons

Number of neutrons = mass number - number of protons. So, 4 - 2=2.

Step6: Determine charge

The charge is given as + 2 in the nuclear notation $^{4}_{2}He^{+2}$.

Step7: Calculate number of electrons

For a neutral atom, number of electrons = number of protons. Here, charge = + 2, so number of electrons=number of protons - charge = 2 - 2=0.

Step8: Identify radiation type

$^{4}_{2}He^{+2}$ is an alpha - particle.

Answer:

1. F. 2
2. F. 2
3. H. 4
4. H. 4
5. F. 2
6. J. 6
7. D. 0
8. A. alpha