Atomic Theory
Atoms and the periodic table
Lewis Dot Structures
Isotopes
IONS
100
In the late 1800's experiments such as J.J. Thompson's Plum Pudding Model, which used cathode ray tubes, led to the discovery of the-
Electron
100
How many valence electrons does Helium (He) have?
2 valence electrons
100
What is the correct Lewis dot symbol for a boron atom?
100
Isotopes are atoms of the same element that have different
Number of neutrons
100
A negative ion is called a(n)
Anion
200
The total number of protons and neutrons in the nucleus of an atom is its
Mass number
200
The following image represents what element?
Carbon
200
What is the correct Lewis dot structure for Aluminum?
200
An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is
27 amu
200
A positively charged ion is called a(n)
Cation
300
The atomic number of oxygen, 8, indicates that there are eight
A.)Protons in the outside of an oxygen atom
B.)Neutrons outside the oxygen atom's nucleus
C.)Protons in the nucleus of an oxygen atom
D.)Energy levels in the oxygen atom's nucleus
C.) Protons in the nucleus of an oxygen atom
300
What do the rows or periods on the periodic table tell us
The number of orbitals/shells/energy levels
300
A student draws a Lewis Dot structure for Neon, how many dots will the student draw?
Eight (8)
300
Calculate the number of neutrons for the following isotopes:
C-12, C-13, C-14
6, 7, 8
300
An atom is electrically neutral because
A.)The numbers of protons and neutrons are equal
B.)The numbers of protons and electrons are equal
C.)Neutrons balance the protons and electrons
D.)Neutrons balance protons
B.) the number of protons and electrons are equal.
400
Electrons in the outer most energy level are called ….
Valence Electrons
400
Phosphorus (P) is in what group and period?
Group 15, period 3
400
What element is represented by the Lewis dot structure below?
A.) Hydrogen (H)
B.) Germanium (Ge)
C.) Nitrogen (N)
D.) Potassium (K)
B.) Germanium (Ge)
400
Chlorine has atomic number 17 and mass number 35. How many protons, electrons, and neutrons?
17 protons, 17 electrons, and 18 neutrons.
400
An ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of
-3
500
The modern model of the atom shows that electrons are located—
In the electron cloud.
500
Considering the octet rule, how many electrons will fill orbitals 1, 2, and 3 for Argon (Ar)?
2-8-8
500
The Lewis Dot symbol below represents which atom?
A.) Neon (Ne)
B.) Sodium (Na)
C.) Chlorine (Cl)
D.) Magnesium (Mg)
D.) Magnesium (Mg)
500
The natural abundance for boron isotopes is 19.9% 10-Boron and 80.1% for 11-Boron. Calculate the average atomic mass for these 2 isotopes of Boron.
10.80 amu
500
Calculate the number of electrons for Co2+
25 electrons.