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How many valence electrons do the halogens possess?

Gallium has an atomic mass of 69.723 amu. The Ga-69 (68.926 amu) is 60.111%. What is the amu of the other isotope?

Calculate the mass (in ng) of 2.33 × 1020 atoms of oxygen.

Place the following elements in order of increasing atomic radius. P Ba Cl

Which of the following elements is a nonmetal?

Which of the following elements is a metalloid?

How many argon atoms are contained in 7.66 × 105 mmol of argon?

Which of the following elements is a gas at room temperature?

Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.161%. What is the amu of the other isotope?

Identify the characteristics of a liquid.