Charges
What is the charge of an electron
negative
How many protons does oxygen have
8
How many valence electrons are in Magnesium
2
What is the charge of a proton
positive
How many neutrons does an atom of O-18 have
10
Which of the following is an excited state
X = 2-8-8-2
Y = 2-8-7-3
Z = 2-8-8
Y
What is the charge of a neutron
neutral
How many neutrons does an atom of K-42 have
23
Write an excited state for the electrons in silicon
2-7-5
What is the charge of an ion if it loses an electron
positive
What is the mass of an atom of Argon with 22 neutrons?
40
As a chlorine atom becomes a negative ion, the atom
a. gains an electron and increases the radius
b. gains an electron and decreases the radius
c. loses an electron and increases the radius
d. loses an electron and decreases the radius
a
What is the charge of an ion if it gains an electron
negative
An atom has an atomic number of 10 and a mass number of 20 and an electron configuration of 2-6-2. What is the total number of neutrons in this?
10
The gold foil experiment led to the conclusion that each atom in the foil was composed mostly of empty space because most alpha particles directed at the foil
a. passed through the foil
b. remained trapped in the foil
c. were deflected by the nuclei in gold atoms
d. were deflected by the electrons in the gold atoms
c