WorksheetsChemical Bonds & Atoms
Total questions: 40
Worksheet time: 40mins
The center of the atom is called:
(a)
The center of an atom contains:
electrons
protons
neutrons
electron shells/ energy levels
True/ False:
The outer region of an atom is called the electron shell. It holds electrons that orbit around the nucleus.
True
False
Which parts of the atom have the same mass?
electron
proton
neutron
none
Vocabulary:
Subatomic particle part of the nucleus of an atom; has no charge; weighs 1 amu.
(a)
A(n) (a) in the atom has a negative charge.
Vocabulary:
Positively charged subatomic particle forming part of the nucleus of an atom; weighs 1 amu
(a)
Vocabulary:
The smallest possible amount of matter which still retains its identity as a chemical element, consisting of a nucleus surrounded by electrons.
(a)
The (a) is the number of protons in an element and is used to distinguish one element from another
True/ False:
Atoms have different properties based on the arrangement and number of particles.
True
False
The periodic table has 18 columns in total, called (a) .
The periodic table has rows, called (a) .
There are _____ rows in the upper table (with 2 rows below showing the rarer elements)
4
7
9
18
True/ False:
Atoms of elements have different number of protons and electrons. They are normally charged.
True
False
The mass number in the periodic table is the number of protons plus the number of electrons.
True
False
Use the periodic table of elements for this question.
If a lithium atom has an atomic mass of 7 amu, how many protons does the lithium atom have?
(a)
Use the periodic table of elements for this question.
If a lithium atom has an atomic mass of 7 amu, how many electrons does the lithium atom have?
(a)
Use the periodic table of elements for this question.
If a lithium atom has an atomic mass of 7 amu, how many neutrons does the lithium atom have?
(a)
Vocabulary:
Different forms of the same atom (difference only in the number of neutrons)
(a)
True/ False:
Isotopes of the same element have different physical properties
True
False
True/ False:
Some isotopes are unstable and will undergo radioactive decay to become other elements.
True
False
Vocabulary:
When an atom does not have an equal numbers of protons and electrons
(a)
Positive ions, called (a) , are formed by losing electrons.
Negative ions called (a) are formed by gaining electrons.
True/ False:
Atoms can lose and donate electrons in order to become more stable.
True
False
Vocabulary:
Electron in the outer energy level/ shell of an atom that interact with other atoms.
(a)
Valence electrons are electrons that can be gained or lost during a chemical reaction.
True
False
Valence electrons cannot be attracted to the nucleus of another atom.
True
False
Valence electrons are usually electrons farthest from the nucleus.
True
False
The number of valence electrons in an atom (main group elements only) is shown by:
Atomic Number
Period
Group
Cannot tell from periodic table of elements
Elements in groups 3-12 are called (a) elements.
Elements in groups 1-2 and 13-18 are called _______ ________ elements.
(a)
Lanthanides and actinides are called the __________ _________ elements.
(a)
The number of energy levels/ shells of an atom is shown by:
Atomic number
Period
Group
Cannot tell from periodic table of elements
Vocabulary:
Simple diagrams that show only valence electrons of atoms
(a)
An atom can have from 1-18 valence electrons.
True
False
Valence electrons are important because they are responsible for:
Most of the properties of an atom
Determining the element of an atom
The type of chemical bond that is formed
Determining whether the element may bond with other elements
True/ False:
Chemical bonds between atoms (ionic, covalent, metallic bond) only changes the valence electrons
True
False
An atom that is not chemically reactive (complete energy level) has _______ valence electrons.
1
2
7
8
An atom that is highly reactive has _____ valence electrons.
1
2
6
7
