question archive Question 16 options:81016182Question 17 options:1 only1 or 22 only8 only0 or 1Question 18 options:metals An isotope of oxygen has 8 protons and 10 neutrons
Question 16 options:81016182Question 17 options:1 only1 or 22 only8 only0 or 1Question 18 options:metals An isotope of oxygen has 8 protons and 10 neutrons
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Question 16 options:81016182Question 17 options:1 only1 or 22 only8 only0 or 1Question 18 options:metals
An isotope of oxygen has 8 protons and 10 neutrons. What is its mass number?
How many electrons can the energy level that is nearest to the nucleus hold?
The elements in Group 2 of the periodic table are all
metalloids
non-metals
gases
radioisotopes
Question 19
Which of the following is always true of a neutral carbon atom?
options:
It cannot be an isotope.
It always has the same number of protons and neutrons.
It never has the same number of protons and neutrons.
It has no electrons in its outermost energy level.
It always has the same number of protons and electrons.
Question 20
Which of the following is a subatomic particle of an atom?
options:
an anion
a nucleus
an ion
a neutron
a cation
Question 21
A magnesium ion has a charge of 2+. It has 12 protons. How many electrons does it have?
options:
2
22
12
0
10
Question 22
Which of the following is true of the elements in Group 1?
options:
They are alkaline earth metals and they react explosively with water.
They are alkali metals and they react explosively with water.
They are alkaline earth metals and they are not reactive.
They are alkali metals and they are not reactive.
They are non-metals.
Question 23
Which of the following is true of a metal in group 1 during an ionic bond?
options:
the metal loses the electron becoming a cation
the metal gains an electron becoming an anion
the metal loses the electron becoming an anion
the metal gains an electron becoming a cation
Question 24
Which group of elements in the periodic table is almost completely unreactive?
options:
noble gases
alkaline earth metals
halogens
alkali metals
All elements are highly reactive.
Question 25
Which of the following ionic compounds is soluble in water?
Question 25 options:
AgCl
CaCO3
PbI2
BaSO4
NH4Br
