Which phrase best describes atoms?

Which of the following cannot be broken down by ordinary chemical means?

An ion is formed when an atom gains or loses

The atomic number of an element represents

The atomic mass of an element represents

What is the symbol for mercury and how many protons does it have?

Which element has 17 electrons, 19 neutrons, 17 protons

If an element is in Period 4 on the periodic table, you know it has

If an element is in Group VIIIA or 18, you know it

Looking at the periodic table of elements, non-metals are

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