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Calcium is an element. What is the smallest particle of calcium that has all the chemical properties of calcium?
subatomic particles
an atom of calcium
125
31
Atoms combine to make all the substances on Earth.
125
9
The electron cloud shows a region in which electrons are likely to be found.
Which statement is supported by the atomic theory?
subatomic particles
an atom of calcium
125
31
Atoms combine to make all the substances on Earth.
125
9
The electron cloud shows a region in which electrons are likely to be found.
Atoms are the building blocks of all matter. Which of the following are the building blocks of atoms?
subatomic particles
an atom of calcium
125
31
Atoms combine to make all the substances on Earth.
125
9
The electron cloud shows a region in which electrons are likely to be found.
The current model of the atom has electrons in a cloud surrounding the nucleus. How does the electron cloud model differ from the Bohr model?
subatomic particles
an atom of calcium
125
31
Atoms combine to make all the substances on Earth.
125
9
The electron cloud shows a region in which electrons are likely to be found.
An atom of lead has the atomic number 82 and a mass number of 207. How many neutrons does this atom of lead have?
subatomic particles
an atom of calcium
125
31
Atoms combine to make all the substances on Earth.
125
9
The electron cloud shows a region in which electrons are likely to be found.
What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?
subatomic particles
an atom of calcium
125
31
Atoms combine to make all the substances on Earth.
125
9
The electron cloud shows a region in which electrons are likely to be found.
An atom of the element gallium (Ga) has 31 protons and 39 neutrons. What is the atomic number of gallium?
subatomic particles
an atom of calcium
125
31
Atoms combine to make all the substances on Earth.
125
9
The electron cloud shows a region in which electrons are likely to be found.
An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
subatomic particles
an atom of calcium
125
31
Atoms combine to make all the substances on Earth.
125
9
The electron cloud shows a region in which electrons are likely to be found.
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