Chemistry, 06.12.2019 19:31, alopez324789

The atomic mass of an element is the total number of which particles in the nucleus?
a. protons
b. neutrons
c. protons and neutrons
d. protons, neutrons, and electrons

Answers: 2

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answered: wow65

The atomic mass refers to the mass consisted in the nucleus of an atom.
And, as electrons revolve around the nucleus but it consist of neutrons and protons in it
Therefore, Mass of an element= Protons and neutrons(Part c)

answered: thulani2

The correct answer is Option c.

Explanation:

There are 3 subatomic particles present in an atom. They are: protons, electrons and neutrons.

Protons: They carry positive charger and are found in nucleus.Electrons: They carry negative charge and are found around the nucleus.Neutrons: They dos not carry any charge and are found in nucleus.

Mass number is defined as the sum of number of protons and number of neutrons present in an atom. It is represented as A.

A = Mass number = Number of neutrons + Number of protons.

Hence, the correct answer is Option c.

answered: Guest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

answered: Guest

So3 that’s what i think

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The atomic mass of an element is the total number of which particles in the nucleus?
a. prot...