WorksheetsAtoms and the Periodic Table
Total questions: 40
Worksheet time: 7mins
the smallest unit of an element that maintains the properties of the element.
atom
neutron
electron
atomic number
a unit of mass that describes the mass of an atom or molecule.
atomic mass unit
electron
neutron
isotope
the number of protons in the nucleus of an atom; the __________ is the same for all atoms of an elements.
atomic number
nucleus
proton
electron
a subatomic particle that has a negative charge.
electron
atomic number
proton
atomic mass unit
an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass.)
isotope
atom
proton
neutron
a subatomic particle that has no charge and that is located in the nucleus of an atom.
neutron
atomic mass unit
atomic number
isotope
an atom's central region that is made up of protons and neutrons.
nucleus
isotope
atom
electron
a subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of __________ in the nucleus is the atomic number, which determines the identity of an element.
proton
electron
nucleus
atomic mass unit
the mass of an atom expressed in atomic mass units.
atomic mass
atomic mass unit
mass number
atomic number
a region around the
nucleus of an atom where electrons are likely to be found.
electron cloud
noble gas
nucleus
isotope
one of the elements of Group 1 of the periodic table (lithium, sodium, potassium, rubidium, cesium, and francium.)
alkali metal
alkaline-earth metal
halogen
period
one of the elements of Group 2 of the periodic table (beryllium, magnesium, calcium, strontium, barium, and radium.)
alkaline-earth metal
halogen
periodic
period
a vertical column of elements in the periodic table; elements in a __________ share chemical properties.
group
mass number
alkali metal
period
one of the elements of Group 17 of the periodic table (fluorine, chlorine, bromine, iodine, and astatine); __________ combine with most metals to form salts.
halogen
period
group
mass number
the sum of the numbers of protons and neutrons in the nucleus of an atom.
mass number
period
periodic law
alkali metal
a horizontal row of elements in the periodic table.
period
group
periodic law
periodic
describes something that occurs or repeats at regular intervals.
periodic
halogen
group
period
the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements.
periodic law
periodic
alkaline-earth metal
alkali metal
one of the elements of Group 18 of the periodic table (helium, neon, argon, krypton, xenon, and radon); noble gases are unreactive.
noble gas
halogen
alkaline-earth metal
alkali metal
How would you describe the nucleus?
dense, positively charged
mostly empty space, positively charged
tiny, negatively charged
dense, negatively charged
Which of the following took place in the late 1800s?
Dalton created a new atomic theory.
Dalton disproved his theory.
Dalton’s theory was proved.
Dalton’s theory was changed.
What is the meaning of the word atom?
dividable
invisible
hard particles
not able to be divided
What did Rutherford believe was in the center of an atom?
an electron
a nucleus
a particle
a proton
What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common?
They each identified new elements.
They each identified new isotopes of atoms.
They each contributed to the development of the atomic theory.
They each conducted experiments in which particles collided.
What is the smallest particle into which an element can be divided and still be the same substance?
electron
neutron
proton
atom
Most metals are
solid at room temperature.
bad conductors of electric current.
dull
not malleable.
The properties of elements in a horizontal row of the periodic table follow
a nonrepeating pattern.
a periodic pattern.
no pattern.
an unpredictable pattern.
What are the left-to-right rows on the periodic table?
periods
families
properties
groups
Which of the following is a property of alkali metals?
They are so hard they cannot be cut.
They are very reactive.
They are stored in water.
They have few uses.
Mendeleev arranged the elements by
density
melting point.
appearance
increasing atomic mass.
Elements lying along the zigzag line on a periodic table are
metals
nonmetals
metalloids
noble gases
How do the physical and chemical properties of the elements change?
periodically within a group
periodically across each period
periodically within a family
periodically across each group
The letter C is carbon’s
atomic number.
atomic mass.
chemical symbol.
element name.
The number at the top left corner is the
atomic number.
element name.
atomic mass.
chemical symbol.
Mendeleev found that the elements’ properties followed a pattern that repeated every
5 elements.
7 elements.
10 elements.
14 elements.
Elements of Groups 3 through 12 are all called
transition metals.
alkali metals.
alkaline-earth metals.
nonmetals.
Noble gases contain ____ electrons in the outer level.
8
6
4
2
In regards to reactivity, elements in following groups are considered very reactive EXCEPT
alkali metals
alkaline-earth metals
noble gases
halogens
This force acts between all objects all of the time.
gravitational force
electromagnetic force
strong force
weak force
This element contains only one electron in its outer level.
Hydrogen
Lithium
Sodium
All of the above.
