Question

The diagram below is an artist’s impression of a single atom of element Be. The neutrons are shown with stripes, the protons are gray, and the electrons are black. These particles are not drawn to scale.
Which element below could be an isotope of this atom?
Need Help Asap! please and thank you.

A.sodium-10
B.beryllium-10
C.boron-9
D.carbon-9

Answer 1

The correct option is B.
Isotopes refers to those chemical compounds which have the same number of protons and electrons but different number of neutrons, so they end up having different mass numbers.  The diagram given above is that of beryllium, which has atomic number 4 and it has 2 electrons in its outermost shell. It has four protons [same as the number of electrons] and 5 neutrons. Beryllium 10, which is its isotope has four electrons, four protons and 6 neutrons. To get the number of neutron, remove the number of electrons from the number given in the option, that is, 10 - 4 = 6.