Use the portion of the periodic table shown below to answer the questions.

Part 1: Name two elements that have the same properties as potassium (K). (4 points)
Part 2: Determine the number of protons, electrons, and neutrons present in an atom of magnesium (Mg). Explain how you determined your answer using complete sentences. (6 points)

I don't know the portion of the periodic table, but for part 1 it is any elements in group 1, so lithium, sodium etc.

For part 2, magnesium has an atomic number of 12, so it has 12 neutrons and 12 protons. It has a relative atomic mass of around 24, so if you take 12 away from 24, it also has 12 electrons.

Answer Link

LucianoBordoli LucianoBordoli · Answer 2 · 2020-01-04T19:17:40+01:00

Answer:

Part 1 : Sodium (Na) and Rubidium (Rb)

Part 2 :

12 protons

12 electrons

12 neutrons

Explanation:

The question is incomplete. I added the portion of the periodic table in order to answer the questions.

Part 1 :

In the periodic table, the elements that are over a column belong to the same group. Because they belong to the same group, they have the same number of electrons in their outermost shell. This electrons are called valence electrons. Because of this, the elements on the same column have similar properties.

In this case, the other two elements in the same column that potassium (K) are

sodium (Na) and rubidium (Rb).

Part 2 : For this part , we need to look at the box of magnesium (Mg).

The upper number (12) is called the atomic number Z.

This atomic number Z is equal to the number of protons in the nucleus of the atom for any element. And is equal to the number of electrons in the nucleus of the atom (If the atom isn't electric charged)

In this case, Z = 12 ⇒ In an atom of Mg there are 12 protons and 12 electrons.

For the number of neutrons, we need to use the number at the below part (24.305). This number is called atomic mass. If we round out this number to the closest integer we obtain 24. This new number is called the mass number A. This number is equal to the sum of Z and the number of neutrons.

A = Z + N

24 = Z + N

Where N is the number of neutrons in the element.

24 - Z = N

24 - 12 = 12 = N

N = 12

The number of neutrons N is equal to 12 in an atom of magnesium (Mg).