Which two particles each have a mass approximately equal to one atomic mass unit?

As the electron in a hydrogen atom gains energy and moves from the first shell to the third shell, the hydrogen atom becomes an

Which phrase describes the protons and neutrons in atoms of two different isotopes of the same element?

Which phrase compares the properties and molecular structure of oxygen, O2(g), and ozone, O3(g)?

Which phrase describes the composition of a compound?

Which quantity is conserved during all chemical reactions?

At STP, a 5.0-gram sample of which substance contains metallic bonds?

When a cesium atom becomes a positive ion, there is a change in electron configuration and radius. Which statement describes this change?

Given the equation representing a reaction: F + F → F2. Which statement describes the changes that occur during this reaction?

Which atom, in the ground state, has a stable valence electron configuration?

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