What is the atom's structure a result of?

The attraction between protons and electrons

The repulsion between protons and electrons

The attraction between neutrons and electrons

The repulsion between neutrons and protons

What is an element in terms of chemistry?

C) A pure substance that cannot be broken down into another substance

A) A mixture that can be separated into simpler substances

B) A compound that can be chemically broken down into elements

D) A solution that contains two or more substances dissolved in each other

How is the periodic table of elements organized?

C) By melting points and boiling points

D) By reactivity and electronegativity

According to the image, what do isotopes of the same element have in common?

The same number of protons and electrons

The same number of neutrons and electrons

The same number of protons and neutrons

The same number of electrons only

What causes the nucleus of an atom to decay and become radioactive?

Changing the number of the neutron in an atom

Changing the number of protons in an atom

All living things contain radioactive isotopes

The process of photosynthesis in plants

What is the half-life of a radioactive isotope?

The time it takes for one-half of the atomic nuclei of a radioactive sample to decay

The time it takes for one-quarter of a radioactive sample to decay

The time it takes for the entire radioactive sample to decay

The time it takes for three-quarters of a radioactive sample to decay

How can scientists estimate the age of an object using carbon-14?

By finding how much carbon-14 remains in the object

By measuring the amount of light it emits

By determining the amount of carbon dioxide it contains

By calculating the number of neutrons in the object's nucleus

What defines a compound in chemistry?

A substance with a chemical formula made up of chemical symbols representing different elements combined.

A mixture of two or more elements that can be separated by physical means.

A single element that can exist in different forms.

A physical combination of substances that can be easily separated.

Which of the following is a characteristic of compounds?

They are chemically and physically different than the elements that comprise them.

They can be broken down into simpler compounds or elements by physical means.

They are always formed from a random combination of elements.

They have the same properties as the elements that comprise them.

How can a compound be broken down into its elements?

By chemical means, such as an electrical current.

By passing it through a filter.

By changing its physical state (e.g., freezing or boiling).

By shaking or stirring vigorously.

Why can't water be separated into hydrogen and oxygen by passing it through a filter?

Because filtering is a physical process, and water is a compound that cannot be separated by physical means.

Because water is a single element, not a compound.

Because water molecules are too small to be filtered.

Because the filter would dissolve in water.

Which of the following statements is true about energy levels in atoms?

A full or empty energy level is more stable than a partially-filled energy level.

A partially-filled energy level is more stable than a full energy level.

The second energy level can hold up to 18 electrons.

The third energy level can hold up to 2 electrons.

What happens when chemical bonds are formed?

Energy is neither released nor absorbed.

Energy is always released as light.

What occurs when chemical bonds break?

Energy is transformed into matter.

Energy is perpetually conserved.

What happens when an atom gains or loses electrons?

It becomes an ion with an electric charge.

What is an ionic bond?

An electrical attraction between two oppositely charged ions.

A sharing of electrons between atoms.

A magnetic attraction between neutral atoms.

A covalent bond between two atoms of the same element.

Which example illustrates the formation of an ionic bond?

Sodium gives its electron to chlorine, forming sodium ion (Na+) and chloride ion (Cl-).

Two chlorine atoms share electrons equally.

A sodium atom shares an electron with a chlorine atom.

A chlorine atom gives an electron to a sodium atom.

What role do ions play in living organisms?

They help maintain homeostasis as they travel in and out of cells.

They prevent chemical reactions in the body.

They are only involved in the formation of bones.

They block signals that enable you to see, taste, feel, and smell.

What occurs when atoms form covalent bonds?

Atoms share electrons with each other.

Atoms transfer electrons to each other.

Atoms remove electrons from each other.

Atoms exchange protons with each other.

Which example is used in the image to explain the formation of a covalent bond?

Oxygen and Hydrogen to form water

Sodium and Chlorine to form salt

Carbon and Oxygen to form carbon dioxide

Nitrogen and Hydrogen to form ammonia

A group of atoms held together by covalent bonds

A group of atoms held together by ionic bonds

A group of atoms held together by metallic bonds

Periodic Table Quiz

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Biology

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KG

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Practice Problem

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Hard

Felicia Landon-Hicks

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What is the atom's structure a result of?

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