1st Semester Final Exam 2024

Front

The groups on the periodic table correspond to the number of ________ in an atom.

Back

valence electrons

Front

Which chemical formula represents a molecule made of 1 potassium, 1 nitrogen, and 3 oxygen atoms?

Back

KNO₃

Front

The particles that are found in the nucleus of an atom are __________.

Back

protons and neutrons

Front

How many protons does this isotope of titanium have?

Back

22

Front

If an atom gains an electron, it is __________.

Back

a negative ion

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is a molecule?

Back

A group of two or more atoms bonded together.

Front

What is an ion?

Back

An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What is the difference between an element and a compound?

Back

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

Front

What does the term 'isotope' refer to?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.