Two isotopes of the same element must have the same

number of protons and different number of neutrons

Elements in a period have

a wide range of chemical properties.

Different samples of an element has 12 protons, but different # of neutrons. Which is true?

They are isotopes of the same element.

What do all neutral elements in group II a have in common?

They all have the same number of valence electrons.

poor conductors of heat and electricity

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Atomic Structure Periodic Table

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Atomic Structure Periodic Table 2015

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Questions 21

Answers

1
Two isotopes of the same element must have the same
atomic symbol and the same number of neutrons
number of protons and different number of neutrons
number of neutrons and the same atomic mass
number of protons and the same atomic mass
2
Elements in a group have
the same number of electrons.
the same atomic mass.
a wide range of chemical properties.
similar properties.
3
The least reactive elements on the periodic table are the:
transition metals
noble gases
halogens
alkali metals
4
Which atomic structure has the least amount of mass?
electron
ion
proton
neutron
5
Most elements on the periodic table are:
metalloids
metals
nonmetals
radioactive
6
Which elements are often used in jewelry and industrial tools?
transition metals
alkaline earth metals
metalloids
rare earth metals
7
Elements in a period have
similar properties.
a wide range of chemical properties.
the same number of valance electrons.
the same number of protons.
8
Which of the following is a noble gas?
Ne (neon)
H (hydrogen)
S (sulfur)
I (iodine)
9
An element that has some properties of both metals and of nonmetals is referred to as a:
radioactive halogen
metalloid
rare earth metal
transition metal
10
Sodium reacts with water. Which element is most likely to have similar properties to sodium?
Iron
Lithium
Magnesium
Bromine
11
Which statement is the best descriptor of a proton?
It moves around the nucleus
It has a negative charge.
It has no mass.
It has a positive charge.
12
All electrons in an atom have what electrical charge?
+2
no charge
-1
+1
13
Which of the elements below would be malleable, ductile, shiny, conduct heat and electricity?
C (carbon)
Fe (iron)
Br (bromine)
S (sulfur)
14
What is the atomic mass of bromine?
35
115
70
80
15
Where is most of the mass of an atom located?
in the neutrons
in the electrons
in the nucleus
in the protons
16
Different samples of an element has 12 protons, but different # of neutrons. Which is true?
The atomic number is different for each element.
They are ions of the same element.
They are isotopes of the same element.
All of the samples have the same atomic mass
17
What do all neutral elements in group II a have in common?
They all have the same atomic number.
They all same number of Bohr energy levels.
They have a wide range of chemical properties.
They all have the same number of valence electrons.
18
The most reactive non-metals are the:
rare earth metals
transition metals
halogens
alkali metals
19
What is the difference between the three isotopes of hydrogen, H-1, H-2, and H-3?
amount of neutrons
size of electron and electron cloud
amount of electrons
amount of protons
20
This isotope contains (58.933 rounded to 60):
27 protons and 33 neutrons
33 protons and 27 neutrons
60 ptotons and 27 neutrons
27 protons and 60 neutrons
21
Most nonmetals are:
liquid at room temperature
poor conductors of heat and electricity
good conductors of heat and electricity
malleable and ductile

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