WorksheetsGrade 7 Atoms & Elements Review
Total questions: 19
Worksheet time: 38mins
Using what you know about atoms, what is the best approximation of the number of hydrogen atoms that could fit on the tip of a needle?
5 atoms
5,000 atoms
50 atoms
5,000,000,000,000 atoms
A student is writing a report on the properties of fluorine. She decides to include a brief section about other elements that are similar to fluorine. In order to find similar elements, she looks up where fluorine is located on the periodic table of elements shown below. The student wants to select the elements similar to fluorine. Which of the following sets of elements should be included?
Helium, sulfur, and argon, because they are diagonal from fluorine.
Oxygen, neon, and chlorine, because they are connected to fluorine.
Nitrogen, oxygen, and neon, because they are in the same row as fluorine.
Chlorine, bromine, and iodine, because they are in the same column as fluorine.
In the 1800s, pure aluminum metal was so valuable that it was worth as much as what?
Silver
Gold
Diamonds
Platinum
What is aluminum commonly used to make today?
Jewelry
Cars
Aluminum cans
Computers
Why do people choose a unit appropriate to the scale of the object?
To make calculations easier
To avoid using very large or very small numbers
To save time
To reduce costs
The mass of a single aluminum can is most likely measured in which unit?
Kilograms
Grams
Milligrams
Pounds
What unit is more appropriate for measuring the mass of a large block of recycled cans?
Grams
Milligrams
Kilograms
Ounces
Which of the following units would be most appropriate for measuring mass at the scale of a single aluminum atom?
Daltons
Ounces
Milligrams
Pounds
Scientists use patterns in the periodic table to
figure out how to turn a metal into a gas.
figure out how many elements there are.
predict what will happen when two elements mix.
predict which elements are expensive.
What is a chemical symbol?
a picture representation of an atomic number
any notation regarding an element made by a scientist
a shorthand notation that represents the name of an element
a sign that tells a scientist how safe it is to handle a particular element
Which of these is a benefit of using chemical symbols when talking about elements?
Chemical symbols are the same across languages.
Chemical symbols are all rooted in the same language.
Scientists are able to label the elements in order of their degree of danger.
Scientists do not actually need to memorize what a chemical symbol stands for.
What is one unit of measurement that scientists use to describe the size of atoms?
picometer
quark
quintille
telomere
The smallest part of any element. Made up of protons, neutrons and electrons.
Atom
AMU
Ion
Isotope
All matter is made of what
energy
atoms
electrons
compounds
What is matter?
Matter has mass and takes up space.
Matter is charged atoms.
Matter has a charge and a mass.
Matter is polar molecules.
Scientists use a _____________ as an abbreviation for an element name.
Atom
Molecule
Compound
Chemical Symbol
The first letter of a chemical symbol is always a
Capital
Lowercase
Number
Symbol
In 1869, Dmitri Mendeleev developed the first periodic table, organizing the elements according to atomic weight. When he ordered the elements, he noticed that there were patterns of repeating properties. The modern periodic table sequences elements from left to right by atomic number.
This was the first person to organize a periodic table.
Neils Bohr
Dmitri Mendeleev
Democritus
Ernest Rutherford
In the periodic table, similar elements are arranged in vertical columns called groups. Some of the major groups include Group 1: alkali metals; Group 2: alkaline earth metals; Group 17: halogens; and Group 18: noble gases. Elements within each group have similar properties and characteristic behaviors because of their similar numbers of valence electrons.
In what direction are groups arranged in the periodic table?
Side to side
Up and down.
Diagonally
In sections.
