Atoms, Elements And Compounds Quiz

2.

The proton is

Negatively charged
Has no charge
Positively charged
Option 4

Correct Answer

A. Positively charged

Explanation

The proton is positively charged because it carries a positive electrical charge. It is one of the fundamental particles that make up the atom, along with neutrons and electrons. Protons are found in the nucleus of an atom and have a charge of +1. This positive charge is balanced by the negative charge of electrons, which orbit around the nucleus.

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3.

The oxygen atom has 8 electrons. What is the number of protons in the oxygen atom?

10
2
8
9

Correct Answer

A. 8

Explanation

The number of protons in an atom determines its atomic number, which is a unique identifier for each element. Oxygen has an atomic number of 8, indicating that it has 8 protons in its nucleus. Therefore, the correct answer is 8.

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4.

How many electrons can the first energy level hold?

Correct Answer
2

Explanation
The first energy level, also known as the K shell, can hold a maximum of 2 electrons. This is because the first energy level consists of only one sublevel, the s sublevel, which can hold a maximum of 2 electrons. Each sublevel can hold a specific number of electrons, with the s sublevel being able to accommodate 2 electrons. Therefore, the correct answer is 2.

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5.

The space surrounding the nucleus in an atom contains

Protons
Electrons
Neutrons
Protons and neutrons

Correct Answer

A. Electrons

Explanation

The space surrounding the nucleus in an atom contains electrons. Electrons are negatively charged particles that orbit the nucleus in specific energy levels or shells. They are much smaller and lighter than protons and neutrons, and they have a negative charge that balances the positive charge of the protons in the nucleus. The arrangement of electrons determines the chemical properties and behavior of an atom.

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3

6.

An ion has an equal number of protons and electrons

True
False

Correct Answer

A. False

Explanation

an ion is an atom that lost or gained an electron

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7.

What distinguishes an element from another

The number of protons
The number of electrons
The number of neutrons
The number of shells

Correct Answer

A. The number of protons

Explanation

The number of protons in an element's nucleus determines its atomic number, which is unique to each element. This means that no two elements can have the same number of protons. The number of protons also determines the element's chemical properties and its place in the periodic table. Therefore, the number of protons is what distinguishes one element from another.

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1

8.

The main elements that make up to 96% of the human body

Carbon, hydrogen and oxygen
Carbon, hydrogen, oxygen and calcium
Carbon, nitrogen, oxygen and hydrogen
Oxygen, calcium and iron

Correct Answer

A. Carbon, nitrogen, oxygen and hydrogen

Explanation

The main elements that make up to 96% of the human body are carbon, nitrogen, oxygen, and hydrogen. These elements are essential for the formation of organic compounds such as carbohydrates, proteins, lipids, and nucleic acids, which are the building blocks of life. Carbon is the backbone of organic molecules, while nitrogen is crucial for protein synthesis. Oxygen is necessary for cellular respiration and energy production, and hydrogen is involved in various biochemical reactions. Calcium and iron are also important for the body, but they make up a smaller percentage compared to carbon, nitrogen, oxygen, and hydrogen.

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1

9.

The type of bonds which forms between 2 ions that lost and gained electrons is called

Correct Answer
ionic

Explanation
Ionic bonds are formed between two ions that have lost and gained electrons. When an atom loses electrons, it becomes a positively charged ion called a cation. On the other hand, when an atom gains electrons, it becomes a negatively charged ion called an anion. The attraction between these oppositely charged ions leads to the formation of an ionic bond. In this type of bond, electrons are transferred from one atom to another, resulting in a stable, electrostatic attraction between the ions.

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Atoms, Elements And Compounds Quiz

The center of the atom is called

Quiz Preview

The proton is

The oxygen atom has 8 electrons. What is the number of protons in the oxygen atom?

How many electrons can the first energy level hold?

The space surrounding the nucleus in an atom contains

An ion has an equal number of protons and electrons

What distinguishes an element from another

The main elements that make up to 96% of the human body

The type of bonds which forms between 2 ions that lost and gained electrons is called