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Atom Flashcards

1
Q

What is the smallest unit of an element?

A

An atom.

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2
Q

True or False: All atoms of a given element have the same number of protons.

A

True.

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3
Q

Fill in the blank: The center of an atom is called the _____.

A

nucleus.

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4
Q

What particles are found in the nucleus of an atom?

A

Protons and neutrons.

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5
Q

What is the charge of a proton?

A

Positive.

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6
Q

What is the charge of a neutron?

A

Neutral.

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7
Q

Multiple Choice: Which particle orbits the nucleus of an atom? A) Proton B) Neutron C) Electron D) Nucleus

A

C) Electron.

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8
Q

What determines the atomic number of an element?

A

The number of protons in the nucleus.

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9
Q

True or False: Electrons have a mass that is significantly larger than protons.

A

False.

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10
Q

Fill in the blank: The number of neutrons plus the number of protons in an atom is called its _____.

A

mass number.

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11
Q

What is an isotope?

A

Atoms of the same element with different numbers of neutrons.

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12
Q

Multiple Choice: Which of the following is NOT an element? A) Oxygen B) Water C) Gold D) Helium

A

B) Water.

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13
Q

What do we call a substance made of only one type of atom?

A

An element.

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14
Q

True or False: The periodic table organizes elements by atomic number.

A

True.

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15
Q

What is a molecule?

A

A group of two or more atoms bonded together.

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16
Q

Fill in the blank: Elements in the same column of the periodic table have similar _____.

A

properties.

17
Q

What is the term for elements that have similar properties and are found in the same group on the periodic table?

A

Families or groups.

18
Q

Multiple Choice: Which of the following is a noble gas? A) Nitrogen B) Neon C) Oxygen D) Carbon

A

B) Neon.

19
Q

What is the primary difference between metals and nonmetals?

A

Metals are typically good conductors of heat and electricity, while nonmetals are not.

20
Q

True or False: The elements in the periodic table are arranged by increasing atomic mass.

A

False.

21
Q

Fill in the blank: The first 20 elements of the periodic table are known as the _____.

A

light elements.

22
Q

What is a chemical symbol?

A

A one or two-letter notation representing an element.

23
Q

What is the significance of the atomic mass of an element?

A

It indicates the average mass of an atom of that element, taking into account the isotopes.

24
Q

Multiple Choice: Which element has the chemical symbol ‘H’? A) Helium B) Hydrogen C) Hafnium D) Holmium

A

B) Hydrogen.

25
Q

True or False: All elements are found naturally on Earth.

A

False.

26
Q

What is a compound?

A

A substance formed when two or more elements chemically bond together.

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