Isotopes
9 protons
What charge do electrons have?
Negative charge
Compare the mass of a proton to the mass of a neutron
They have approximately the same mass (1 u)
How many electron shells does an atom of Ca have?
4 electron shells
What is the name of the table of elements?
Periodic Table
O-16 and O-18 have the same ___ but different ___
same protons, different neutrons
How many total electrons does sodium have?
11 total electrons
What two subatomic particles are located in the nucleus?
protons and neutrons
Compare the energy of an electron in the third shell to the energy of an electron in the first shell.
The energy of an electron in the third shell has more energy. or The energy of an electron in the first shell has less energy.
What is the name of the element Fe?
Iron
What is one isotope of C-12?
C-11, C-13, C-14, etc.
How many valence electrons does Br have?
7 valence electrons
Compare the mass of a proton and the mass of electron.
The proton has much more mass than an electron. or The electron has much less mass than a proton.
The space where an electron lives in the electron cloud is called an _____
Orbital
When two atoms with the same charge are next to each other, they ____
Repel
|Bet| How many neutrons does an atom of 15N have?
8 neutrons
|Double points| How do you write a potassium ion that has lost one electron?
K+1 or K+
If an atom has too many neutrons or too few neutrons, it becomes _____
Unstable
When excited electrons go from a higher electron shell to a lower electron shell, they emit _____
Light
How many significant figures does .009870 have?
4 significant figures
Write a numerical setup for the atomic mass of Cl if Cl-35 has a mass of 34.98 and an abundance of 75% and Cl-37 has a mass of 36.95 and an abundance of 25%
(34.98)(75%) + (36.95)(25%)
What element has an excited electron configuration of 2-7-7?
Sulfur or S
|Double points| Rutherford's gold foil experiment discovered that the nucleus was ________ and the most of the volume of an atom was _______
nucleus was positive and most of the volume of an atom was empty.
Compare the amount of energy released by electrons in chemical reactions to the amount of energy released by neutrons in nuclear reactions.
The amount of energy released in nuclear reactions is higher.
|Bet| What is the net charge of an atom with 4 protons and 5 electrons?
-1