Chemistry Unit 1

The electron has a mass number of ___ and a charge of ___

0 and -1

The protons have a mass number of ___ and a charge of ____

1 and +1

The neutron has a mass number of ____ and a charge of _____

1 and 0

the atomic number of ___. it has ___protons. the mass of the atom is ___. Each atom of phosphorous-30 has ___ electrons and ____neutrons

15. 15. 30. 15. 15

the atomic number of _____. it has ____ protons. the mass number of the atom is ____. each atom of cobalt-60 has ___ electrons and ____ neutrons.

27. 27. 60. 27. 33

an atom of gallium-70 has an atomic number of ___, and a mass number of ____. It has ___ protons, ____ electrons, and ____ neutrons

31.70. 31. 31. 39

the atomic number of ___. it has ____ protons. the mass number of the atom is _____. each aotm of arsenic-75 has ___electrons and ____ neutrons.

33. 33. 75. 33. 42

What is true about the nucleus

It contains most of the mass of the atom. It is positively charged.It is the location of the neutrons. It is the location of the protons.

For an atom (which is nuetral), which of these must be true.

The number of protons is equal to the number of electrons.

there are three isotopes of hydrogen. they are hydrogen-1, hydrogen-2, and hydrogen 3. What do these isotopes of carbon have in common?

They have the same number of electrons, they have the same atomic number, they have the same number of protons.

The smallest particle of an element that retains all the properties of that element is

an atom

the laws of electrostatics predict that protons will ____ electrons. Protons will ___ other protons. Electrons will repel ___ other electrons. Neutrons will ____ protons, electrons, and other neutrons.

attract. repel. repel. have no effect on.

In what ways is an atom of carbon -14 different than a carbon-12?

carbon-14 has more neutrons and carbon-14 has a large mass number

What describes the electron cloud of an atom

constitutes most of the volume of the atom. negatively charged.

What correctly describes the nucleus of the atom

contains most of the mass of the atom. positively charged. dense.

place the particles in order from the first one discovered to the last one discovered.

electron, proton, and neutron

What is true about the electron cloud

it contains most of the volume of the atom.it is negatively charged. it contains most of the electrons.

An atom contains six protons

must be carbon atom, must have six electrons.

Repulsion between closely packed protons in the nucleus is overcome by

nuclear forces

a particular has seven electrons and eight neutrons

this atom is nitrogen-15 and it has seven electrons and eight neutrons. A mass number of the atom 15