Chemistry Basics

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What charge do protons have?

Back

Protons have a positive charge.

Front

What is the charge of neutrons?

Back

Neutrons have no charge (they are neutral).

Front

What is the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

How many protons are in Potassium (K)?

Back

Potassium has 19 protons.

Front

How many electrons are in a neutral atom of an element?

Back

In a neutral atom, the number of electrons equals the number of protons.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Tags

NGSS.HS-PS1-1

Front

What is an isotope?

Back

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons.

Tags

NGSS.HS-PS1-8

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

What is the electron configuration of Krypton (Kr)?

Back

The electron configuration of Krypton is [Ar] 4s² 3d¹⁰ 4p⁶.

Tags

NGSS.HS-PS1-1