Protons, Neutrons, and Electrons

Front

What are protons, neutrons, and electrons?

Back

Protons are positively charged particles found in the nucleus of an atom, neutrons are neutral particles also located in the nucleus, and electrons are negatively charged particles that orbit the nucleus.

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 protons does Argon have?

Back

Argon has 18 protons.

Front

What is the relationship between atomic number and the number of electrons in a neutral atom?

Back

In a neutral atom, the number of electrons is equal to the atomic number.

Front

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

Back

The number of neutrons can be calculated by subtracting the atomic number from the atomic mass (rounded to the nearest whole number).

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 electrons does Sodium have?

Back

Sodium has 11 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 many neutrons does Sodium have?

Back

Sodium has 12 neutrons (23 - 11 = 12, where 23 is the atomic mass of Sodium).

Front

What is the atomic number of Calcium?

Back

The atomic number of Calcium is 20.