Answer:
b. 45 u
Explanation:
the mass of an atom is equal to the protons plus neutrons:
26+19=45
hope this helps :)
The mass of an atom that comprise 26 protons, 26 electrons, and 19 neutrons is 45 u.
• The mass of a single atom of a chemical element is known as its atomic mass.
• Three subatomic particles forms an atom, that is, protons, electrons, and neutrons.
• The mass of an atom is equivalent to the total number of protons and neutrons present within it, electrons do not play any role in atomic mass.
• The neutrons and protons are the subatomic particles present within the nucleus of an atom and gives an atom its mass.
• Therefore, to find the atomic mass of an atom, there is a need to add protons and neutrons, that is, 26+19 = 45 in the given case.
Thus, the atomic mass of the atom given is 45u.
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