Question

identify label the element key.

Explanation:

Step1: Identify the atomic number

The number \(2\) represents the atomic number of the element helium (\(He\)). The atomic number is the number of protons in an atom's nucleus and uniquely identifies an element.

Step2: Identify the element symbol

The symbol \(He\) is the standard chemical symbol for helium. Chemical symbols are abbreviations used to represent elements.

Step3: Identify the element name

The word “Helium” is the name of the element. It is the common name used to refer to the element with atomic number \(2\).

Step4: Identify the atomic mass

The number \(4.003\) is the atomic mass of helium. The atomic mass is the weighted average mass of an element's isotopes.

Answer:

• The number \(2\) is the atomic number.
• \(He\) is the element symbol.
• “Helium” is the element name.
• \(4.003\) is the atomic mass.