A positively charged subatomic particle found in the nucleus of an atom is

A negatively charged particle located outside the atom's nucleus is

A subatomic particle that has no charge and that is found in the nucleus of an atom is

A center of an atom is

An area around the center of the atom where electrons are located

The smallest particle of an element that still retains the element's properties is

Given the atomic number 13, the mass number 27, how many neutrons does it have?

Which part of an atom makes up most of its mass?

Which determines the identity of an element?

Adding the number of protons and neutrons in an atom results in the 

An element's _______ is the same as the number of protons in the nucleus of its atoms.

What part of an atom has a mass of 0?

A proton has a charge of a -1.

The number of electrons in an atom of an element is the element's atomic number.

Which symbol represents carbon?

The element beryllium (Be, atomic number 4 and atomic mass 9) is right above magnesium (Mg, atomic number 12 and atomic mass 24) in the periodic table. How many more electrons does magnesium have than beryllium?

Which is the correct symbol for the element sodium?

How many electrons does the first energy level hold?

What is the maximum number of electrons does the 2nd energy hold?

What is the maximum number of electrons the 3rd energy level holds?

What is the maximum number of electrons the 4th energy level can hold?

Protons and electrons of an atom have the mass of 1 amu.