$$\text{Number of neutrons} = \text{Mass number} - \text{Atomic number}$$

Question 1

Which of the following statements best describes an element?

Accepted Answer

An element is a pure substance from which all other things are built and cannot be broken down into simpler substances.

Question 2

Which of the following is the correct chemical symbol for magnesium?

Accepted Answer

Mg

Question 3

The chemical symbol 'Fe' is derived from the Latin name for which element?

Accepted Answer

Ferrum, which is iron

Question 4

A farmer needs to apply a fertilizer containing potassium. Which chemical symbol should they look for on the fertilizer label?

Accepted Answer

K

Question 5

Which of the following elements is a metalloid and is essential for the growth and maintenance of bones and teeth?

Accepted Answer

Silicon (Si)

Question 6

Which group on the periodic table is known as the alkali metals?

Accepted Answer

Group 1A (1)

Question 7

Which of the following statements about mercury (Hg) is TRUE?

Accepted Answer

Mercury is a liquid at room temperature and can damage the brain and kidneys upon long-term exposure.

Question 8

Which of the following best describes the arrangement of elements in the modern periodic table?

Accepted Answer

Elements are arranged by increasing atomic number and grouped by similar chemical properties.

Question 9

Which element is located in Group 7A (17), Period 4 of the periodic table?

Accepted Answer

Bromine (Br)

Question 10

Which of the following is a property of nonmetals?

Accepted Answer

They are poor conductors of heat and electricity.

Question 11

A neutral atom of calcium (Ca) has an atomic number of 20. How many protons and electrons does it have?

Accepted Answer

20 protons and 20 electrons

Question 12

Which of the following equations correctly calculates the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of neutrons} = 	ext{Mass number} - 	ext{Atomic number}$$

Question 13

An atom has 14 protons and 20 neutrons. What is its mass number and which element is it?

Accepted Answer

Mass number = 34; Element = Silicon (Si)

Question 14

Which isotope of lithium is more abundant if the atomic mass of lithium is 6.941 amu?

Accepted Answer

Li-7

Question 15

Which of the following electron arrangements is correct for sodium (Na)?

Accepted Answer

2, 8, 1

Question 16

Which element has the highest ionization energy among the following: K, Ca, Br?

Accepted Answer

Br

Question 17

Which of the following trends is correct for atomic size across a period from left to right?

Accepted Answer

Atomic size decreases

Question 18

Which of the following elements is a trace element (micromineral) essential for the maintenance of blood sugar levels?

Accepted Answer

Chromium (Cr)

Question 19

Which of the following statements about isotopes is TRUE?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Atoms and Elements: Structure, Properties, and Periodic Trends

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