Question 1

Radon is a metal.

Accepted Answer

Radon is not a metal. It is a noble gas with the atomic number 86 and belongs to the same group as helium, neon, argon, krypton, and xenon.

Question 2

Chromium is a metal.

Accepted Answer

Chromium is a chemical element with the symbol Cr and atomic number 24. It is classified as a metal and is commonly used in alloys, stainless steel production, and other industrial applications.

Question 3

The symbol for mercury is Mg.

Accepted Answer

The symbol for mercury is Hg, not Mg. Mg is the symbol for magnesium.

Question 4

The proton is 2000 times the mass of the neutron.

Accepted Answer

The neutron is slightly more massive than the proton, so the statement is false.

Question 5

Mercury is a metal.

Accepted Answer

Mercury is a metal and a chemical element with the symbol Hg and atomic number 80. It is commonly known as quicksilver and is the only metal that is liquid at room temperature.

Question 6

Write the electron arrangement for the atom shown.
-Phosphorus

Accepted Answer

The answer of Write the electron arrangement for the atom...

Question 7

The proton has a positive charge.

Accepted Answer

The proton is a positively charged subatomic particle found in the nucleus of an atom.

Question 8

The mass number is equal to the number of electrons.

Accepted Answer

The mass number is equal to the sum of protons and neutrons in an atom, while the number of electrons is equal to the number of protons in a neutral atom. Therefore, the mass number is not equal to the number of electrons.

Question 9

The symbol for potassium is P.

Accepted Answer

The symbol for potassium is K, not P.

Question 10

The atomic number is equal to the number of protons.

Accepted Answer

The atomic number of an element is defined as the number of protons in the nucleus of an atom. Therefore, the statement is true.

Question 11

Write the electron arrangement for the atom shown.
-The symbol for gold is Au.

Accepted Answer

Since the question only asks for the electron arrangement of an atom and does not provide any specific isotope or ion of gold, we can assume that it refers to the neutral atom of gold. The electron arrangement for neutral gold would be 2-8-18-32-18-1, which follows the standard electron configuration notation.

Question 12

Write the electron arrangement for the atom shown.
-Magnesium

Accepted Answer

The answer of Write the electron arrangement for the atom...

Question 13

Iodine is a metal.

Accepted Answer

Iodine is a non-metal.

Question 14

A lead atom with a mass number of 208 has 126 neutrons.

Accepted Answer

The mass number of an atom is the sum of the number of protons and neutrons in the nucleus. If a lead atom has a mass number of 208, then it must have 82 protons (since the atomic number of lead is 82) and 126 neutrons. Therefore, the statement is true.

Question 15

A sodium atom with a mass number of 23 has 23 neutrons.

Accepted Answer

A sodium atom with a mass number of 23 has 11 protons (since it's sodium) and thus must have 12 neutrons (23 - 11 = 12) to make up the mass number.

Question 16

A calcium atom two electrons in the fourth energy level.

Accepted Answer

Calcium has an electron configuration of 2,8,8,2 with the last two electrons in the fourth energy level (also known as the valence shell).

Question 17

A copper atom with 30 neutrons has a mass number of 59.

Accepted Answer

The mass number of an atom is equal to the sum of its protons and neutrons. Since the copper atom has 30 neutrons, the number of protons can be calculated as 59 - 30 = 29. This corresponds to the atomic number of copper, which is also 29. Therefore, the statement is true.

Question 18

Sulfur is a nonmetal.

Accepted Answer

Sulfur is a nonmetal element located on the right side of the periodic table, along with other nonmetals such as oxygen, nitrogen, and fluorine.

Question 19

The symbol for sodium is So.

Accepted Answer

The symbol for sodium is Na, not So.

Question 20

The atomic number of sodium is 23.

Accepted Answer

The atomic number of sodium is 11.

Quiz 4: Atoms and Elements