Unit 1 MS-PS1-1

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 many valence electrons do elements in group 13 have?

Back

Elements in group 13 have 3 valence electrons.

Front

What does atomic mass represent?

Back

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

Front

What is the basic unit of matter?

Back

The basic unit of matter is an atom, which is the smallest particle of an element.

Front

What is a chemical symbol?

Back

A chemical symbol is a one or two-letter notation used to represent an element on the periodic table.

Front

What is the significance of the number 12.011 in chemistry?

Back

The number 12.011 represents the atomic mass of carbon.

Front

What is a Bohr model?

Back

A Bohr model is a diagram that represents the arrangement of electrons in an atom, showing energy levels.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the Periodic Table of Elements?

Back

The Periodic Table of Elements is a tabular arrangement of all known elements, organized by increasing atomic number.

Front

What are isotopes?

Back

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