Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. what is its atomic number and atomic mass number? the atomic number is 79, and the atomic mass number is 197.the atomic number is 79, and the atomic mass number is 118.the atomic number is 118, and the atomic mass number is 197.the atomic number is 118, and the atomic mass number is 79.

The atomic number is 79 and the atomic mass is 197.

Explanation:

The atomic number (symbol Z) of a chemical element is the number of protons within its nucleus.

Gold (chemical symbol Au)  is a chemical element with  79 protons in its nucleus, therefore with atomic number 79.

The atomic mass is the  average mass of the atoms of an element (in atomic mass unit). The atomic mass is the weighted average of all the isotopes of a a particular element. For each isotope the atomic mass is approximately the mass of both protons and neutrons since electrons make minor contributions.

The atomic mass of Gold (Au) is 196.9665  but, it can be rounded to 197.

The atomic number can be defined as the number of protons present in an element.

The atomic mass number is the averaged sum of the mass of the protons and neutrons of all the available isotopes of the element.

The given gold atom has 79 protons and 118 neutrons.

Thus, the atomic number will be the total number of protons. The atomic number of the gold atom will be 79.

The atomic mass number = protons + neutrons

Atomic mass number = 79 + 118

Atomic mass number = 197

Thus, the atomic mass number of the gold atom is 197.

The atomic number of the gold atom is 79, and the atomic mass number is 197.

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an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.