WorksheetsUnit 3 Ps
Total questions: 20
Worksheet time: 10mins
How was Bohr's atomic model different from those of previous scientists?
It showed that electrons could jump from one path to another.
It included positive and negative parts.
It showed that electrons were located outside the nucleus.
It included a nucleus.
The diagram shows a model of an atom. Who first proposed this model?
Rutherford
Dalton
Bohr
Thomson
Which two particles are always found in equal numbers in neutral atoms?
Protons and electrons
Protons and neutrons
Electrons and neutrons
Neutrons and ions
What is one characteristic of an electron?
Almost no mass
Almost no charge
A mass of 1 amu
A charge of +1
The box shows the element helium as it appears in the periodic table. Which list gives the correct numbers of subatomic particles for a neutral atom of helium?
Two protons, two neutrons, two electrons
Four protons, four neutrons, four electrons
Two protons, two neutrons, four electrons
Two protons, four neutrons, six electrons
The box shows the element beryllium as it appears in the periodic table. How many protons and electrons does a neutral atom of beryllium have?
Four protons, four electrons
Two protons, two electrons
Four protons, five electrons
Nine protons, nine electrons
Based on their chemical formulas, which of these common substances is an element?
Gold (Au)
Salt (NaCl)
Water (H2O)
Sugar (C6H12O6)
Oxygen gas is made of molecules like the one this model shows. Which chemical formula most likely describes oxygen gas?
O2
OO
O100
OG
Which two types of information are found in an element's box in the periodic table?
Chemical formula and symbol
Chemical symbol and Atomic number
Atomic structure and number
The diagram shows the box for the element krypton in the periodic table. What is the chemical symbol for this element?
Kr
Kryptonite
k
Krypton
Neon is a colorless gas that is not known to react with any other substance. Which other element is most likely to be a nonreactive gas?
Xe, number 54
Na, number 11
F, number 9
Cs, number 55
The columns in the periodic table are called groups. What do the elements in Group 2 have in common?
They tend to form ions with a +2 electric charge.
They are all highly reactive nonmetals.
They tend to form ions with a –2 electric charge.
They are all found in nature in their pure forms.
The periodic table below shows major regions in different colors. In this periodic table, which color or colors represent the elements that are metals?
Blue only
Orange and green
Blue and green
Orange only
The periodic table below shows major regions in different colors. Which answer choice describes all nonmetals?
Hydrogen and all of the other elements in orange boxes
All of the elements of Period 2 in green boxes
Hydrogen and all of the elements in blue boxes
All of the elements of Group 18 in orange boxes
In models of molecules, spheres of different colors and sizes represent different types of atoms. Which model shows a molecule of a substance that is made up of three elements?
Which type of matter is always made up of only one kind of atom?
Element
Molecule
Compound
Mixture
The photograph shows the most abundant substance on Earth's surface. Which fact about this substance tells you that it is a compound?
It can be separated into two substances by a chemical process.
It appears to be the same type of matter throughout.
It is a colorless liquid that is inflammable.
It is made up of atoms that have mass and take up space.
Granite, shown in the photo, is a common type of rock. Based on how this sample looks, which term describes the matter that makes up granite?
Mixture
Pure substance
Compound
Element
Based on their chemical formulas, which of these common substances is an element?
Silver (Ag)
Marble (CaCO3)
Quartz (SiO2)
Bleach (NaClO)
Which two formulas represent compounds?
HCl and NaCl
NaCl and H2
H2 and Ag
Ag and HCl
