1. Define the following terms:
A. Nucleon number
B. Proton number
2. The nucleon number of an atom is also called ??
3.An atom of an element has 15 protons and 16 neutrons. What is the nucleon number?
4. An atom has a proton number of 19 and a nucleon number of 39. Calculate its number of protons and neutrons in the atom.
Answers
Answer:
A. The mass number (symbol A, from the German word Atomgewicht [atomic weight]), is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.The mass number is different for each different isotope of a chemical element.
B. The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
2. also called atomic mass number or nucleon number
3.This is the isotope phosphorus-31. It has 15 protons, 15 electrons, and 16 neutrons. Nucleon number is the number of protons plus the number of neutrons. The nucleon number, commonly referred to as A, does not lead to any particular properties in and of themselves except for identifying isotopes of different atoms.
4. 19 protons, 20 neutrons and 18 electrons.
Explanation:
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