An atom of antimony has a mass number of 122. The atomic number of antimony is 51. Calculate the number of protons and neutrons in this atom – work must be shown to earn credit.

The number of protons and neutrons of antimony is 51 and 71 respectively.

Explanation:

We have for antimony:

A: mass number = 122

Z: atomic number = 51

The atomic number is equal to the number of protons, hence the antimony has 51 protons.

The mass number is:

Where:

N: is the number of neutrons

Then, the number of neutrons is:

Therefore, the number of protons and neutrons of antimony is 51 and 71 respectively.

I hope it helps you!  

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

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 have energy higher than those in the orbital while lower than those of the orbital.

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

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration 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 and should be highlighted as well.

your answer is c) plasma

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