Question

PLEASE HELP!!

1.)
What would be the effect on the nucleus of an atom if it emitted one alpha particle and one gamma ray?

a decrease of two in atomic number and a decrease of four in mass number

an increase of one in atomic number and a decrease of two in mass number

an increase of one in atomic number and an increase of two in mass number

an increase of two in atomic number and an increase of four in mass number

2.)
When is nuclear decay by beta particle emission more common in atoms?

have an atomic number greater than 83

have a high proton to neutron ratio

have a high neutron to proton ratio

have a low proton to neutron ratio

3.)
If an atom of polonium-218 were to undergo positron emission, which nuclide would result?

bismuth-218

bismuth-217

astatine-218

astatine-217

4.)
A certain chemical reaction experiences a 7.50 × 10-7 kilogram loss in mass. If this mass were to be totally converted to energy, what would be the magnitude of that energy? (1 J = 1 )

1.20 × 1023 J

2.5 × 109 J

4.00 × 101 J

6.75 × 1010 J

Answer 1

Answer: (a)

Decrease of two in atomic number and a decrease of four in mass number

Step-by-step explanation:

The effect on the nucleus of an atom if it emitted one alpha particle and one gamma ray is:

Alpha (α) particles are like He+2 nucleus which has 2 protons and 2 neutrons. Thus after emitting α particles there will be decrease of atomic number by 2 and mass number will be decreased by 4. And the emission of gamma ray does not produce effect on the number of protons and neutrons.