Front

What is a halogen?

Back

Halogens are a group of elements in Group 17 of the periodic table, known for their reactivity. Examples include fluorine, chlorine, bromine, iodine, and astatine.

Front

Which element is a halogen?

Back

Chlorine is a halogen.

Front

What determines the chemical properties of an atom?

Back

The outermost electron shell determines the chemical properties of an atom.

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 also equals the number of electrons in a neutral atom.

Front

How many electrons does an atom with atomic number 12 have?

Back

An atom with atomic number 12 has 12 electrons in a neutral state.

Front

What is the atomic number of gold?

Back

The atomic number of gold is 79.

Front

What is the significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What is Group 2 in the periodic table?

Back

Group 2 contains alkaline earth metals, which are reactive and include elements like beryllium, magnesium, calcium, strontium, barium, and radium.

Front

What is the electron configuration of magnesium?

Back

The electron configuration of magnesium (atomic number 12) is 1s² 2s² 2p⁶ 3s².

Front

What are the properties of halogens?

Back

Halogens are nonmetals, have high electronegativity, and are highly reactive, especially with alkali metals and alkaline earth metals.