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WorksheetsUnit 1 Test
Total questions: 40
Worksheet time: 10hrs 0mins
When a neutral atom loses one electron, the particles formed is:
A positive ion
A negative ion
a molecule
an isotope
The electron configuration of the elements W,X,Y and Z are shown below. Which element is likely to form a -2 ion?
2,8,2
2,8,1
2,8,5,
2,8,6
The atomic number of an element is 12 and the mass number is 25. One atom of the element consists of:
13 protons, 12 neutrons, 13 electrons
12 protons, 13 neutrons, 12 electrons
13 protons, 13 neutrons 13 electrons
12 protons 13 neutrons 13 electrons
Consider the equation: Na(g) + energy ----------> Na+ (g) + e-
The energy term in this equation is called the:
electron affinity
electronegativity
ionization energy
none of the above
Atoms of element X, having two valence electrons, combine with atoms of the element Y, having seven valence electrons. Which of the following statements is true?
X-2 ions are formed
Y-2 ions are formed
The compounds has the formula X2Y
The compound has the formula XY2
Based on the properties of Ca, O, Na, Al, and Cl which one of the following statements is true?
only Ca and Na are metals
Cl is the only non-metal
Al is the only metal
Cl and O are the only non-metals
When a bromine atom becomes an ion in a chemical reaction the :
ion has the same diameter as the atom
ion has a smaller diameter than the atom
ion has a larger diameter than the ion
nucleus becomes larger
Rutherford performed an experiment which provided evidence that atomic nuclei are:
positively charged and close together
negatively charged and close together
positively charged and far apart
negatively charged and far apart
The universally accepted standard for atomic and molecular masses is:
1/12 the mass of the most common carbon isotope
1/16 the mass of the most common oxygen isotope
the mass of the most common isotope of hydrogen
the mass of a standard at the National Bureau of Standards
Electron affinity is a measure of the tendency of an atom to:
gain electrons
lose electrons
gain protons
lose protons
The elements Na, Ne, Mg, and S listed in order of increasing first ionization energy are:
Na Ne Mg S
Ne Mg Na S
Na Mg S Ne
Ne S Mg Na
An ion with 12 protons, 10 neutrons and 11 electrons has a charge of :
+1
+2
-1
-2
The group of particles having the same number of electrons in each particle is:
He Li+ Be
Ne Na+ Ca+2
Ar Cl- S
Ar K+ O-2
The atomic mass of an element is determined primarily by the:
# of protons in the nulceus
# of neutrons in the nucleus
sum of protons and neutrons in the nucleus
sum of protons and electrons in the atom
The number of electrons in a neutral atom is the same as the atom’s:
mass number
valence
atomic number
# of neutrons
The symbol O816 represents and oxygen atom:
with a mass of 8u
with a mass of 16u
with an atomic # of 16
with 16 neutrons
Which of the following sub-atomic particle has the smallest mass?
electron
proton
neutron
al are equal
The bond in an N2 molecule can be described as:
an ionic bond
a polar bond
a double bond
a triple bond
What forces or bonds are primarily responsible for holding the two oxygen atoms together in a molecule of O2?
ionic bonds
dipole dipole forces
VanderWalls forces
Covalent bonds
The number of atoms represented by 2Al2(SO4)3 is:
14
17
19
34
Forces between the atoms within a molecule are:
VanderWalls forces
intermolecular forces
intramolecular forces
ionic forces
Which of the following electron configurations represents the element whose neutral atoms have the smallest average ionic radius?
2,8,1
2,8,3
2,8,7
2,8,8
The compound that is most likely to contain covalent bonds is:
sodium chloride
magnesium fluoride
beryllium oxide
sulfur dioxide
The following is a list of the usual charge found on the ions in a series of elements:
V+3 W+2 X+ Y- Z-2
Which elements are most likely to be metals?
V&W
V&W&X
X&Y
Y&Z
Consider the electrons configuration for five elements.
V 2,8,6
W 2,8,7
X 2,8,8
Y 2,8,8,1
Z 2,8,8,2
The elements most likely to form covalent compounds are:
V&W
V&Y
X&Z
Y&Z
In which of the following types of bonds are the particles held together by the sharing of electron pairs?
ionic bonds
metallic bonds
covalent bonds
hydrogen bonds
In a diatomic hydrogen molecule, each hydrogen atom has the same outer shell electron configuration as an atom of the gas:
oxygen
chlorine
helium
ammonia
The water molecule is said to be:
ionic
electrovalent
a dipole
multivalent
In the H–Cl bond, the two bonding electrons are located:
closer to the hydrogen
closer to the chlorine
equal distance from both
at opposite ends of the bond
The strongest ionic bonds exist between:
Na&F
K&F
Li&F
Cl & F
Van der Walls forces are:
intramolecular forces of attraction which cause molecules to condense
forces between the extra pairs of electrons on F, N and O and neighbouring molecules
the attraction of electrons in one molecule for the nuclei of atoms in neighbouring molecules.
stronger than ionic bonds
Metals usually tend to:
Share electrons
gain electrons
form positive ions
form negative ions
Which of the following has a coordinate covalent bond?
oxygen
ammonia
sulfur dioxide
hydrogen iodide
Which of the following compounds contains the most polar covalent bond?
carbon tetrachloride
hydrogen fluoride
water
boron tribromide
Which of the following is an element consisting of diatomic molecules?
copper
hydrogen
helium
silicon
Most metals can be best described as:
brittle, dull and dense
soft, powdery and light
hard, shiny and dense
flexible, powdery and dense
A solid has a very high melting point. This indicates that the substance must be:
a metal
an ionic crystal
held together by strong forces of attraction
a molecular crystal
Ionic bonds may be considered to result from:
the union of atoms of equal ionization energies
the transfer of one or more electrons form one atom to another
the sharing of electrons by atoms
the alkali metals reacting with alkaline earths
The term electronegativity refers to the fact that:
an electric current is a stream of negative particles called electrons
some element conduct electricity while others do not
it requires energy to remove electrons form neutral atoms
the attraction for electrons in a bond formed between two different atoms can be unequal
Which of the following statements about isotopes of the same element is true?
all isotopes of the same element have the same number of neutrons
all isotopes of the same element have the same number of protons
neutral atoms of isotopes of the same element have different numbers of electrons
atoms of different isotopes of the same element have the same mass
