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- Multiple ChoicePlease save your changes before editing any questions.
An element is made up of
one type of atom
two types of atoms
three types of atoms
more than three types of atoms
- Multiple ChoicePlease save your changes before editing any questions.
When 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n)
element
compound
isotope
ion
- Multiple ChoicePlease save your changes before editing any questions.
Which statement accurately describes the chemical symbol of an element?
The chemical symbol is always a single letter.
The chemical symbol always starts with the same letter as the name of the element.
The chemical symbol always begins with a capital letter.
The chemical symbol can be shared by more than one element.
- Multiple ChoicePlease save your changes before editing any questions.
The element copper has 29 protons. What is the atomic number of copper?
29
18
21
22
- Multiple ChoicePlease save your changes before editing any questions.
An electron in the first energy level of the electron cloud has ______________ an electron in the third energy level.
a lower energy than
a higher energy than
the same energy as
- Multiple ChoicePlease save your changes before editing any questions.
An isotope has the same number of ____ but a different number of ____ than the other atoms of the same element.
protons, neutrons
neutrons, protons
electrons, protons
neutrons, electrons
- Multiple ChoicePlease save your changes before editing any questions.
An isotope of the element fluorine has 9 protons and 10 neutrons. What is the name of this isotope?
Remember the number at the end of an isotope's name is the mass number.
fluorine-19
fluorine-21
fluorine-1
fluroine-2
- Multiple ChoicePlease save your changes before editing any questions.
When electrons are lost, a _______ ion is formed.
positive
negative
neutral
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When electrons are gained, a _______ ion is formed.
positive
negative
neutral
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The aluminum atom __________ electrons to form a positive ion.
loses
gains
neither gains nor loses
- Multiple ChoicePlease save your changes before editing any questions.
What is the name of the aluminum ion?
Al–1
Al+2
Al–3
Al+3
- Multiple ChoicePlease save your changes before editing any questions.
What can be added to an atom to cause a non-valence electron in the atom to temporarily become a valence electron?
energy
mass
neutrons
electrons
- Multiple ChoicePlease save your changes before editing any questions.
Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained. What is true about all uranium atoms?
They each have the same number of nuclear particles.
They each have the same number of neutral particles.
They each have the same number of neutrons.
They each have the same number of protons.
- Multiple ChoicePlease save your changes before editing any questions.
How many electrons are in the third energy level?
2
8
18
20
- Multiple ChoicePlease save your changes before editing any questions.
All atoms of the element potassium have 19 protons. One of the most stable types of potassium atoms has the mass number 39. How many neutrons make up one of these potassium atoms?
mass number = protons + neutrons.
19
20
38
58
- Multiple ChoicePlease save your changes before editing any questions.
Scientists are working with a liquid that is made of only one type of atom. Which statement correctly describes this liquid?
The liquid contains only one compound.
The liquid contains only one element.
The liquid contains only neutral electrons.
The liquid can be broken down into simpler substances.
- Multiple ChoicePlease save your changes before editing any questions.
What is the number at the end of an isotope’s name?
atomic number
neutron number
mass number
electron number
- Multiple ChoicePlease save your changes before editing any questions.
Which are different forms of an element that have different numbers of neutrons?
ions
isotopes
compounds
molecules