2. Atoms & Elements

Which of the following best describes the fundamental particles that make up matter?

How many protons are present in an atom represented by 22088Ra?

Why are atoms electrically neutral under normal conditions?

Which of the following is found at the center of every atom?

Why do different atoms produce distinct lines in their emission spectra?

Which subatomic particle is found in the nucleus of an atom and has a positive charge?

Which part of the atom is primarily responsible for allowing one atom to react with another atom?

Which element has an atomic number that is exactly double that of silicon?

Which of the following best describes the electric charge of a proton?

Which of the following is an atom rather than a molecule?

Which of the following best describes the electric charge of a proton?

How many electrons are present in a neutral atom of lithium?

How many protons are present in an atom of tungsten (W)?

Which statement about one atom of an element identifies the element?

According to diagrams showing elemental abundances in the Milky Way galaxy, which element is the third most abundant?