Question

multiple choice 1 point
how many electrons does one neutrally - charged atom of argon have?
40
18
22
58
multiple choice 1 point
the table shows the number of each of the three subatomic particles for four atoms.

atom	protons	neutrons	electrons
2	8	8	8
3	6	8	6
4	7	8	7

which atoms represent the same element?

Explanation:

Step1: Recall atomic number concept

In a neutral atom, the number of electrons is equal to the number of protons. The atomic number of an element is equal to the number of protons. Argon has an atomic number of 18.

Step2: Determine electron number

Since in a neutral argon atom, number of electrons = number of protons, and atomic number of argon is 18, a neutral argon atom has 18 electrons.

for second - part:

Step1: Recall element - defining factor

Elements are defined by the number of protons. Atoms with the same number of protons are of the same element.

Step2: Analyze the table

Atom 1 has 6 protons and Atom 3 has 6 protons. So, Atom 1 and Atom 3 represent the same element.

Answer:

18