The mass number of an atom is the number of
A) protons in the nucleus of an atom.
B) protons and neutrons combined in the nucleus of an atom.
C) neutrons in the nucleus of an atom.
D) electrons in an atom.
E) protons and electrons combined in an atom.
Correct Answer:
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Q12: Living organisms are composed of elements made
Q13: Electrons exist as orbitals around the nucleus
Q14: The energy levels of electrons in their
Q15: An element is a substance made up
Q16: The small, negatively charged particles in an
Q18: Living organisms are composed predominantly of which
Q19: The chemical properties of elements are determined
Q20: Elements in living organisms are
A) similar to
Q21: Carbon has 4 electrons in its outer
Q22: Nitrogen has 5 electrons in its outer
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