Question 1

According to the periodic table, the atomic mass of potassium (K) is ______. ?

Accepted Answer

The atomic mass of potassium (K) is approximately 39.10. Atomic mass is a weighted average of all the naturally occurring isotopes of an element, measured in atomic mass units (amu).

Question 2

_____ make up the majority of compounds found in living organisms.

Accepted Answer

Building-block elements such as carbon, hydrogen, nitrogen, and oxygen make up the majority of compounds found in living organisms. These elements are the foundation for organic molecules such as carbohydrates, proteins, lipids, and nucleic acids. Macronutrients, micronutrients, metals, and metalloids also play a role in biological systems, but they do not make up the majority of compounds found in living organisms.

Question 3

The average atomic mass of zirconium is

Accepted Answer

The atomic mass of an element takes into account the abundance of all naturally occurring isotopes, not just the most abundant one. While zirconium does have a relatively high abundance of the isotope ⁹⁰Zn, it also has other isotopes present. Therefore, the average atomic mass of zirconium is expected to be greater than 90 but less than 96.

Question 4

According to the periodic table, which element is found in period 2, group 5A?

Accepted Answer

The element found in period 2, group 5A is nitrogen, which is in the 5th column or group of the periodic table and is in the second period or row.

Question 5

According to the periodic table, which element is in period 4, group 6A?

Accepted Answer

In the periodic table, periods are the rows and groups are columns. So, counting from the top, the element in period 4, group 6A is Selenium (Se), which is option D.

Question 6

According to the periodic table, which of the following sets of terms accurately describes chlorine?

Accepted Answer

The answer of According to the periodic table, which of...

Question 7

What is the identity of element X?

Accepted Answer

The answer of What is the identity of element X?...

Question 8

An element is a solid at room temperature and a shiny, metallic grey. However, it is a poor conductor of electricity and temperature and it is also brittle. Which of the following elements fits this description?

Accepted Answer

Antimony is a solid at room temperature and has a metallic grey color. It is a poor conductor of electricity and heat and is also brittle, making it the best fit for this description. Oxygen is a gas at room temperature, while lithium, helium, and iron are all good conductors of electricity and heat, which contradicts the description given.

Question 9

According to the periodic table, the atomic number of potassium (K) is ______. ?

Accepted Answer

The atomic number of an element is the number of protons in its nucleus. According to the periodic table, the atomic number of potassium is 19.

Question 10

What is the mass number of element X?

Accepted Answer

The answer of What is the mass number of element...

Question 11

The elements numbered 21-30 are examples of _______..

Accepted Answer

The elements numbered 21-30 on the periodic table are known as transition metals.

Question 12

According to the periodic table, what types of elements are in group 7A?

Accepted Answer

Group 7A, also known as Group 17, contains the halogens, which are highly reactive nonmetals.

Question 13

Which of the following statements about isotopes is false?

Accepted Answer

All the statements A, B, C, and D are true descriptions of isotopes, so none of them is false.

Question 14

The periods are the _____ of the periodic table.

Accepted Answer

Periods are the horizontal rows on the periodic table.

Question 15

The number of protons is equal to the _____ in a neutral atom.

Accepted Answer

The number of protons, also known as the atomic number, is what determines the element. In a neutral atom, the number of protons must be balanced by the number of electrons, so the number of electrons is also equal to the number of protons. The number of neutrons and the mass number can vary for the same element, depending on the isotope. The average atomic mass is a weighted average of the masses of all the isotopes of an element, and the group number refers to the column on the periodic table where the element is located, which is not necessarily related to the number of protons.

Question 16

Which of the following terms is NOT a characteristic of a metal?

Accepted Answer

Metals are not gases at room temperature. They are typically solid, shiny, malleable, and good conductors of heat and electricity.

Question 17

How many electrons are in a neutral atom of element X?

Accepted Answer

The answer of How many electrons are in a neutral...

Question 18

Most of the micronutrients are

Accepted Answer

Micronutrients are essential nutrients required by plants in very small quantities for their growth and development. These nutrients include transition metals such as iron, zinc, copper, manganese, molybdenum, and boron, which are necessary for various metabolic processes in the plant. Therefore, the best choice is A, i.e., transition metals.

Question 19

What is the atomic number of element X?

Accepted Answer

The answer of What is the atomic number of element...

Question 20

An atom of carbon containing 7 neutrons can be written which of the following ways?  All of the choices are correct.

Accepted Answer

The answer of An atom of carbon containing 7 neutrons...

Quiz 2: Atomic Structure and Nuclear Radiation