21.
How many neutrons are in the 23Na11 atom?
A
12
B
11
C
18
D
24
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How many neutrons are in the 23Na11 atom?
12
11
18
24
How many electrons are in the 6C12 atom?
12
6
18
3
Binding energy is:
the amount of energy required to break a nucleus apart into protons and neutrons.
the amount of energy required to break a nucleus apart into protons and electrons.
the amount of energy required to break a nucleus apart into electrons and neutrons.
the amount of energy released when neutrons change energy levels.
A 100 g sample of a radioactive element has a half-life of 5 days. How many grams of radioactive material will remain after 15 days?
100 g
50 g
25 g
12.5 g
An unknown chemical element is presented by the following formula: AXZ. What is the name of index Z?
Atomic mass number
Atomic number
Principle quantum number
Orbital quantum number
An unknown chemical element is presented by the following formula: AXZ. What is the name of index A?
Atomic mass number
Atomic number
Principle quantum number
Orbital quantum number
An isotope with a high Binding Energy per nucleon:
will decay in a short period of time.
is very unstable.
is very stable .
has very few electrons.
A reaction that releases more energy than is put into it is called:
endothermic
exothermic
nuclear
chemical