Which of the following is true about subatomic particles?

the mass of a neutron is the same as the mass of an electron.

neutrons have a negative charge and are the heaviest subatomic particle.

protons are positively charged and are one of the heaviest subatomic particles.

electrons are neutral and are the lightest subatomic particle.

Protons are positively charged and are one of the heaviest subatomic particles

Explanation:

A typical atom consists of three subatomic particles: protons, neutrons, and electrons.

Using Method of elimination;

Option 1 - This is incorrect because the mass of a neutron is slightly greater than the mass of a proton. Electrons are extremely small. The mass of an electron is only about 1/2000 the mass of a proton or neutron

Option 2 - This is incorrect because Neutrons are neutral with no net charge however the mass of a neutron is slightly greater than the mass of a proton.

Option 3 - This is correct because protns are indeed positively charged as the name implies and are one of the heaviest sub atomic particles.

Option 4 - This is incorrect because electrons are negatively charged. However they are indeed the lightest sub atomic particle.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.