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WorksheetsUnit 1 Mid Unit Assessment Review (8.5A & 8.5B)
Total questions: 31
Worksheet time: 31mins
All matter is made of what
energy
atoms
electrons
compounds
The positive particles of an atom are
electrons
positrons
neutrons
protons
The central region of an atom where its neutrons and protons are is its
nucleus
electron cloud
core
center
An atom with an atomic number 6 would have how many protons
6
12
3
cannot be determined
Particles in an atom that are neutral and have no charge are
negatrons
electrons
neutrons
protons
True or False: Neutrons have a negative charge
true
false
What is the atomic number of an element with 3 protons?
2
3
1
6
A particle that moves around the nucleus is a(n)...
proton
neutron
electron
quark
What does the 1.0078 stand for?
Hydrogen
atomic mass
atomic number
atomic explosion
Which statement accurately describes the atoms of a specific element?
An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus
A scandium, Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus
An aluminum, Al, atom contains 27 electrons and 27 protons inside the nucleus
A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus
Which statement correctly describes the location and charge of the electrons in an atom?
the electrons are inside the nucleus and have no charge
the electrons are outside the nucleus and have no charge
the electrons are inside the nucleus and have a negative charge
the electrons are outside the nucleus and have a negative charge
What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112?
(a)
What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom of aluminum, Al?
(a)
How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
72 protons, 178 neutrons, 106 electrons
72 protons, 106 neutrons, 72 electrons
178 protons, 250 neutrons, 72 electrons
106 protons, 72 neutrons, 106 electrons
An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom?
(a)
In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that charged the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty space with -
protons orbiting a dense nucleus made of electrons and neutrons
electrons orbiting a dense nucleus made of protons and neutrons
neutrons and protons orbiting a cloud of electrons
electrons and protons orbiting a cloud of neutrons
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom's nucleus?
(a)
Which subatomic particle identifies an element?
(a)
Which part of the atom determines chemical reactivity?
(a)
Tin, Sn, is a soft white metal. It has a low melting point compared with other metals. Tin is widely used as a coating for cans of foods. Which statement accurately describes atoms of tin?
Tin atoms have 50 protons
Tin atoms have five valence electrons
Tin atoms have 119 neutrons
Tin atoms have 68 electrons
A chemist is identifying the elements present in a sample of seawater. What characteristic of an element's atoms always determines the element's identity?
the number of protons
the number of neutrons
the location of valence electrons
the number of valence electrons
What subatomic particle would you find in the nucleus of an atom?
protons only
protons and neutrons
neutrons and electrons
protons and electrons
If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the mass of the atom?
10
20
30
What subatomic particle(s) would be found orbiting the nucleus?
neutrons only
electrons only
protons and neutrons
protons and electrons
Protons and electrons balance the charge of an atom
true
false
Compounds are made of two or more different elements.
true
false
What particle uniquely identifies an element?
number of valence electrons
number of protons
number of electrons
atomic mass
Most of the mass in an atom is concentrated in the
electrons
nucleus
protons
empty space
Electrons are
extremely small even in comparison to protons
part of nucleus
super positive
very large
Anything that has mass and takes up space is called
heterogeneous
homogeneous
matter
density
An atoms overall charge is
positive
depends on its mood
neutral
negative
