protons/neutrons
How many neutrons does an atom of
Arsenic have in its nucleus?
42 neutrons in its nucleus
Elements are made from a single type of what?
Atom
Elements in the same column of the Periodic Table have what in common?
The same number of electrons in the outermost shell
What is Half-life?
The amount of time it takes for half an initial amount to disintegrate.
Nuclear fission is when scientists put atoms together.
False
How many protons does an atom of
Helium have in its nucleus?
two protons
The atomic number of an atom is the number of what in the atom's nucleus?
Protons
What family of elements is in the left-most column of the Periodic Table?
Alkali metals
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
12.5 g
In which of the following process are Neutrons emitted?
Nuclear fission
How many protons does an atom of
Beryllium have in its nucleus?
What element has an atomic number of 1?
Hydrogen
Which of the following is the abbreviation for the element gold?
Au
Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?
2.5g
Heavy nuclei must be such that they can be fissioned by neutrons of an energy such substance are called?
Fission species
How many neutrons does an atom of
Cerium have in its nucleus?
82 neutrons
What are the different physical forms of an element called?
Allotropes
What scientist is usually credited with inventing the Periodic Table?
Dmitri Mendeleyev
The radiation detected from a piece of rock is reduced significantly when the rock is wrapped in foil. What type of radiation is being emitted?
Beta
Why should neutrons with lower energy be capable of causing fission?
For a sustained reaction process
How many neutrons does an atom of
Chromium have in its nucleus?
28 neutrons
According to the article, how many elements are there in the current periodic table?
118
What is the name of the family of elements that has a full outer shell of electrons?
Noble gases
When nuclei decay, massive amounts of what are released?
energy
What happens when a neutron is absorbed by a nucleus of an atom of U235?
U236 isotope is formed