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. mc017-1.jpg Which element below could be an isotope of this atom? sodium-10 beryllium-10 boron-9 carbon-9

Answer 1

Answer: B

Step-by-step explanation:

Answer 2

Answer is: beryllium-10.

The diagram shows that atom has 4 protons, 5 neutrons and 2 valence electrons.

Atomic number is the number of protons, which is characteristic of a chemical element, beryllium (Be) is an element with atomic number 4.

Two valence electrons means that atom is from 2. group of periodic table, only beryllium is from that group; sodium (1. group), boron (13. group) and carbon (14. group).

Beryllium-10 has 6 neutrons, so it is isotope (different number of neutrons or mass number).