Atomic Structure

Front

What is the mass number of an atom?

Back

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

Front

What does the atomic number represent?

Back

The atomic number represents the number of protons in the nucleus of an atom.

Front

If an element has 9 protons, what is its atomic number?

Back

The atomic number is 9.

Front

How many protons are in an atom with an atomic number of 15?

Back

There are 15 protons in the atom.

Front

What is the formula to calculate the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number.

Front

An element has a mass number of 11 and an atomic number of 5. How many neutrons does it have?

Back

It has 6 neutrons.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

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

Front

What is the significance of the atomic number in the periodic table?

Back

The atomic number determines the position of an element in the periodic table and its chemical properties.

Front

How do isotopes of an element differ from each other?

Back

Isotopes of an element differ in the number of neutrons they contain.

Front

What is the mass number of an atom with 10 protons and 12 neutrons?

Back

The mass number is 22 (10 protons + 12 neutrons).