Which pair below describes isotopes of the same element?
a) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons
b) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons
c) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons
d) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons
8)

B

Explanation:

For exhibit isotopy, atoms of the element must have the same proton number (atomic number) but different mass number.

In Option B

The two atoms have same atomic number (6) but different mass number (12 and 13 respectively).

Mass num = proton number + Neutron number

Unlike the other options.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

they all get energy from eating other animals, dead animals to be more precise.

hienas tends to steal pray from other animals. crows and vultures tend to eat dead animals and leftovers.

hope it ,

bioteacher101