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 Silicon (Si) have?

Back

Silicon (Si) has 14 protons.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that determine its chemical properties and reactivity.

Front

How many valence electrons does an atom with 1 valence electron have?

Back

1 valence electron.

Front

What is the mass of an electron compared to protons and neutrons?

Back

An electron has the smallest mass compared to protons and neutrons.

Front

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

Back

Subtract the atomic number (number of protons) from the atomic mass (rounded to the nearest whole number).

Front

What is the atomic mass of an atom?

Back

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

Front

What is the significance of the APE MAN strategy in chemistry?

Back

APE MAN stands for Atomic number = Protons, Electrons; Mass number = Protons + Neutrons.

Front

How many neutrons does Phosphorus (P) have if its atomic number is 15 and its atomic mass is 31?

Back

Phosphorus has 16 neutrons (31 - 15 = 16).

Front

What determines an element's reactivity?

Back

An element's reactivity is primarily determined by the number of valence electrons.