Periodic Table & Subatomic Particles

To determine the type of element that you have (like Carbon, Nitrogen, Gold etc...), you must look at the number of ___________ in the atoms of that element.

• protons

• neutrons

• electrons

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The smaller number at the top of an element box is called the _____________ and it tells us the number of protons found in the nucleus of atoms of that particular element.

• electron shell

• atomic number

• atomic mass

• ion

If an atom is not charged, it's number of positives and negatives will be equal. Therefore the number of ______________ equals the number of _____________ in a neutral atom.

• neutrons and protons

• electrons and neutrons

• protons and electrons

The mass of the atom (atomic mass or mass number) tells us how much the atom weighs. It is the sum of the ______________ and the __________.

• protons ; electrons

• protons; neutrons

• neutrons; electrons

To find the number of neutrons in an atom do the following...

• Look at the atomic number at the top of the element box

• Look at the atomic mass at the bottom of the element box

• Atomic Mass + Atomic #

• Atomic Mass - Atomic #