Atoms and Isotopes Flashcards

Flashcards about atoms and isotopes based on Year 10 Core Science notes.

What are atoms?

Building blocks of all matter.

What are the three main types of sub-atomic particles?

Protons, Neutrons, and Electrons

What is the charge of a proton?

Positively charged

What is the charge of a neutron?

Neutral (no charge)

What is the charge of an electron?

Negatively charged

Where are protons and neutrons located?

In the nucleus

Where are electrons located?

In shells around the nucleus

What is the atomic number of an element?

The number of protons in its nucleus

What is the mass number?

Number of protons + number of neutrons

What are isotopes?

Atoms that belong to the same element, with the same number of protons, but different numbers of neutrons.

In atomic notation, what does X represent?

Chemical Symbol

In atomic notation, what does A represent?

Atomic Mass (of Isotope)

In atomic notation, what does Z represent?

Atomic Number

Why are masses on the periodic table expressed as decimals?

Weighted averages of all known isotopes of the element.