Which statement best describes the Bohr/Planetary model of the atom?

Electrons orbit around the nucleus in set paths

Which of the following includes an example of a physical property of an element?

The melting point of Aluminum is 660 degrees Celsius

What is the atomic number of an atom equal to in a neutral atom?

The number of protons in the nucleus

Which best describes the current atomic theory?

Atoms are composed of electrons in a cloud around a positive nucleus

Atoms with the same number of protons but a different number of neutrons

Which statement best describes the density of an atom’s nucleus?

very little of the atom’s volume but contains most of its mass

Where are the electrons inside an atom?

They are arranged in energy levels

Which of the following would identify properties of a metal?

malleable, having luster, good conductor

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Semester 1 Review

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Questions 21

Answers

1
Which of these is not a heterogeneous mixture?
Salad
Sand and rocks
Trail mix
Salt water
2
Which of the following elements is classified as a metal?
S
Br
He
Li
3
Which of the following lists the first four sublevels correctly?
S2, p6, d10, f14
S1, p2, d3, f4
S1, p3, d5, f7
S2, p4, d6, f8
4
Which statement best describes the Bohr/Planetary model of the atom?
Electrons have properties similar to waves
Electrons orbit around the nucleus in set paths
Electrons make up most of the mass of the atom
Electrons are arranged in energy clouds
5
Which of the following includes an example of a physical property of an element?
Sodium reacts to form hydrogen gas and sodium hydroxide when placed in H2O
Iron rusts when exposed to air
Aluminum will react with bromine to form Aluminum Bromide
The melting point of Aluminum is 660 degrees Celsius
6
What is the chemical symbol for hafnium?
H
hf
Hn
Hf
7
Which of the following gives an example of a chemical change?
Melting an ice cube
Folding a piece of paper
Cracking an egg
Burning a piece of wood
8
The elements which are very non-reactive elements in group 18 are called:
Halogens
Alkali metals
Metalloids
Noble gases
9
What is the atomic number of an atom equal to in a neutral atom?
The number of electrons and neutrons in the nucleus
The number of protons in the nucleus
The number of neutrons in the nucleus
The number of protons and neutrons in the nucleus
10
Which best describes the current atomic theory?
Atoms consist of electrons circling in definite orbits
Atoms are composed of electrons in a cloud around a positive nucleus
An atom’s mass is determined by the mass of its neutrons
Atoms can easily be split, at which time they become radioactive
11
How many neutrons does this atom of carbon have?
8
14
20
6
12
What are isotopes?
Atoms with the same number of protons but a different number of neutrons
Atoms with same atomic number but different number of protons
Atoms with the same mass number but a different atomic number
Atoms with different numbers of electrons
13
What is the average atomic mass of Hydrogen?
H
1.0079
1
0
14
Which statement best describes the density of an atom’s nucleus?
very little of the atom’s volume but contains most of its mass
most of the atom’s volume but contains little of its mass
very little of the atom’s volume and contains little of its mass
most of the atom’s volume and contains most of its mass
15
The ions in most ionic compounds are organized into a
polyatomic ion
molecules
crystal lattice
Lewis Structure
16
Ionic compounds are formed by ionic bonds between
metals and nonmetals
metals and metals
nonmetals and nonmetals
transition metals
17
What is the center of an atom called?
Neutrons
Protons
Nucleosomes
Nucleus
18
Which of the following atoms has six valence electrons?
Ar
S
Si
Mg
19
Where are the electrons inside an atom?
They are arranged in energy levels
The electrons are in the nucleus
The electrons are spread equally throughout the atom
The electrons are imaginary
20
What is the charge of an electron?
+2
-1
0
+1
21
Which of the following would identify properties of a metal?
It is a gas at room temperature
malleable, having luster, good conductor
malleable, poor conductor, shiny
Dull, brittle, poor conductor of heat and electricity

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