Using the periodic table of elements, how many valence electrons would helium have?

If a particular atom of an element has five protons a neutral atom of this element would have ________ electrons.

Valence electrons are important because these are the only electrons involved with an atom's

What is the atomic number of hydrogen?

If an atom gains some extra electrons so that its valence shell becomes full, what happens to the atom?

Which of these atoms have a total of fourteen electrons?

How many valence electrons does a neutral atom of aluminum have?

If calcium lost two electrons it would have the same number of electrons as

If oxygen gained two electrons how many electrons would be in its outer shell?

Which of these elements has the most chemically non-reactive atoms?

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