Create an atom with mass number equal to 3 and neutral charge. Click the red button
when done.

In order to solve the question, one must understand that:

An atom is made up of neutrons which has no charge, negatively charged electrons, and positively charged protons. The mass number of an atom is the number of protons plus neutrons of the atom. It is also the atomic mass number of the atom.A neutral atom has an equal number of positive (proton) and negative (electron) charges.

Hence, in order to create a neutral atom with a mass number of 3, the proton and neutron number must add up to 3 while the proton and electron number must be equal.

More on mass number can be found here: link

A) 4 amusingb)alpha particle is a helium nucleus. it contains 2 protons and 2 neutrons.c)alpha particle has charge of +2.

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