How many protons does potassium have?

What element has 3 energy levels and 2 valence electrons?

Which element is in group 6 and period 4

Which element has a smaller atomic mass, but would react chemically similar to Sulfur?

Which subatomic particle(s) make up the atomic mass of an atom?

If an element has 17 protons, 18 neutrons and 17 electrons, what is its mass?

If an element has 38 protons, 50 neutrons and 38 electrons, how many negatively charged particles does it have?

How many valence electrons does Aluminum have?

An element has an atomic number of 21 and a mass number of 45. How many neutrons does the element have?

How many energy levels does Calcium (atomic number 20) have?

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