A magnesium ion has a double positive charge and a chloride ion has a single negative charge.
Which statement is correct?
A chlorine atom gains an electron to form the chloride ion.
A chlorine atom loses a proton to form the chloride ion.
A magnesium atom loses an electron to form the magnesium ion.
A magnesium atom gains two electrons to form the magnesium ion.
A
Which row correctly describes an example of radioactive decay?
original
nucleus
emission
change or
no change of element
stable
γ
change of element
unstable
α
change of element
unstable
α
no change of element
unstable
β
no change of element
B
The notation represents the nucleus of a gold atom.
\section*{197 \\ 97Au}
The relative charge on a proton is +1 .
What is the relative charge on the gold nucleus?
+79
+118
+197
+276
A
How are positive and negative ions formed from atoms?
positive ion
negative ion
add positive charge to the nucleus
add an electron to the atom
add positive charge to the nucleus
remove positive charge from the nucleus
remove an electron from the atom
add an electron to the atom
remove an electron from the atom
remove positive charge from the nucleus
C