Atoms and Periodic Table

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

How do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Atomic mass - Atomic number.

Front

What is the mass number of an element?

Back

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

Tags

NGSS.MS-PS1-1

Front

What are groups in the periodic table?

Back

Groups are the vertical columns in the periodic table that contain elements with similar chemical properties.

Front

What are periods in the periodic table?

Back

Periods are the horizontal rows in the periodic table that indicate the number of electron shells in the elements.

Front

Which element is in group 2 of the periodic table?

Back

Beryllium (Be) is located in group 2 of the periodic table.

Front

What is the significance of the atomic mass of an element?

Back

The atomic mass indicates the average mass of an atom of an element, accounting for the relative abundance of its isotopes.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

How are elements arranged in the periodic table?

Back

Elements are arranged in order of increasing atomic number from left to right.

Front

What is the charge of a proton?

Back

A proton has a positive charge.