The sum of the protons and neutrons contained in a nucleus is the ______. A) ato

Question

The sum of the protons and neutrons contained in a nucleus is the ______. A) atomic mass number B) atomic weight C) atomic number D) atomic orbital DNA is a ______. A) protein B) enzyme C) nucleic acid D) nucleotide Protons of elements are located in the ___________. A) first energy level B) orbital C) nucleus D) sphere Electrons are found in the ___________. A) nucleus B) shells C) orbitals D) P shells only Which of the statements below best describes the difference between an element and a molecule? A) An element is composed of atoms: a molecule is not. B) An element is composed of only one kind of atom. C) An element is unstable. D) Elements always have lower atomic weights than molecules. E) Elements exist in nature only as parts of molecules. A chemical reaction known as a synthesis is represented by the following: A) AB + CD rightarrow AD + BC B) XY rightarrow X + Y C) A + B rightarrow AB D) AB + CD = AD + CB E) A and D

Explanation / Answer

(39)

(A)Atomic mass number

Sum of neutrons and protons constitute atomic mass

Just the protons constitute atomic number

(40)C.Nucleic acid

(41)C.Nucleus

Protons and neutrons are located in nucleus, while electrons are in the orbitals around the nucleus

(42)C. Orbitals

(43)B.An element is composed of only one kind of atom

(44)C. A+B---->AB

In synthesis reaction, two or more simple substances combine to form a more complex product

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