Question

1. drag and drop the labels with the descriptions of an element.

label 1
label 2
label 3

Explanation:

• The atomic number is the number of protons in an atom's nucleus and is unique to each element. Here, 8 is the atomic number.
• The element symbol is a one - or two - letter abbreviation for the element. 'O' is the symbol for oxygen.
• The atomic mass is the weighted average mass of an element's isotopes. 15.999 is oxygen's atomic mass.

Answer:

Label 1: atomic number
Label 2: element symbol
Label 3: atomic mass