ATOMS
name the 3 sub-atomic particles in an atom
protons, neutrons, electrons
how many elements in NaOH
3
Give a definition of an isotope
Atoms of the same element with a different number of neutrons
During nuclear decay atoms change from 1 form to another in a process called
Transmutation
what sub-atomic particle in an atom is the smallest
electron
What charge doe the nucleus of an atom have
positive
give a definition of a compound
2 or more different elements chemically combined
An alpha particle is
2 protons plus 2 neutrons
Half-life is the time it takes for
half a sample of atoms to decay
Atomic mass is the number of ..........
protons plus neutrons
where do we find the electrons in an atom
in shells surrounding the nucleus
the number of atoms in H2SO4
7
If a Na (sodium) atom loses 1 proton what does it become
Ne - neon
Carbon-14 can be used for
carbon dating fossils
How many electrons are in the 1st and 2nd shells of an atom
2 in 1st shell, 8 in 2nd shell
how are elements different from compounds
elements have only 1 type of atom, compounds have more than one type of atom
the rows on a periodic table are called
periods
How many protons and neutrons are in C-14
6 protons, 8 neutrons
If I have 100g of a radioactive isotope with a half-life of 10 years how much will remain after 20 years
25g
beta particles are identical to:
protons, neutrons or electrons
electrons
the atomic number of an element tells us
the number of protons in the element
How many atoms in Al(OH)3
7
In Beta decay, an electron is lost and a neutron takes on a different charge - is it positive or negative
positive
Which radioactive substance is large, heavy and slow:
alpha, beta or gamma
Alpha
The alpha particle is identical to the nucleus of what atom
helium