Question

A model of an atom is shown below. Which element is represented by this model of an atom?

Answer 1

The answer is B. Boron

The number of electrons and protons are always the same in an atom.
There are 5 electrons which means there are also 5 protons.
The number of Protons determines the atomic number of an element.
Since the element has 5 protons its atomic number is 5, the same atomic number as Boron

Answer 2

Explanation:

The given model of atom shows that there are 5 electrons and 5 protons. As it is known that when an atom is neutral in nature then it contains same number of protons and electrons.

Also, the given model of atom has 6 neutrons. So, this means that atomic number of this atom is 5 and its atomic mass will be calculated as follows.

                 Atomic mass = no. of protons + no. of neutrons

                                        = 5 + 6

                                        = 11

Hence, it means that given atom is boron because only boron has an atomic number of 5 and atomic mass 11 g/mol.

Thus, we can conclude that boron is the element which is represented by this model of an atom.