2. Atoms & Elements

Which of the following pairs of atomic models represent the same element?

An atom with an atomic mass of 89 and an atomic number of 39 has how many neutrons?

How many protons are present in a neutral atom of sodium (Na)?

The atomic number of sulfur is 16. This indicates that a sulfur atom contains:

Which of the following best describes the interaction between the nucleus of an atom and its own electrons?

An ion has 104 electrons, 157 neutrons, and 102 protons. What is the mass number of this ion?

What is the atomic number of nitrogen?

Which of the following best describes the overall charge of the nucleus of an atom?

Which statement best describes atoms?

How many protons are present in the nucleus of an argon (Ar) atom?

Which of the following best describes an atom that has fewer neutrons than protons and more electrons than protons?

How many protons are present in a neutral atom of beryllium?

Which statement accurately describes the atoms of a specific element?

How many protons and electrons are present in a neutral atom of vanadium (V)?

Stars are composed primarily of which elements?