Chemistry section 4
Atomic mass unit
1/12 the mass of a carbon-12 atom
Number of protons
All atoms of the same element have the same...
48 protons, 48 electrons and 72 neutrons
An atom of an element with atomic number 48 and mass number 120 contains..
False
Atoms of isotopes of an element have different numbers of protons
Isotopes
Atoms with the same number of protons but different numbers of neutrons
Atoms are all divisible
Dalton theorized that atoms are indivisible and that all atoms of an element are identical. Scientists now know that...
False
Electrons have a mass of 1 amu
Hydrogen-3 has two neutrons
How do the isotopes hydrogen-2 and hydrogen-3 differ
25/12 E and 25/12 E
If E is the symbol for an element, which two of the following symbols represent isotypes of the same element
Electron
Negatively charged subatomic particle
Proton
Positively charged subatomic particle
amus
Relative atomic masses are measured in ..
Neutron
Subatomic particle with no charge
Atomic mass
The weighted average mass of the atoms in a naturally occurring sample of an element
Atoms are always in motion
This is not apart of dalton so atomic theory
Period
A horizontal row of the periodic table
Positively charged and gas a high density
The nucleus of an atom is...
The mass number
The number 80 in the name bromine-80 represents ...
Subtracting the number of protons from the mass number
The number of neutrons in the nucleus of an atom can be calculated by...
Atomic number
The number of protons in the nucleus of an element
Atom
The smallest particle of an element that retains its identity in a chemical reaction
Mass number
The sum of the protons and neutrons in an atom equals the ...
Mass number
The total number of protons and neutrons in the nucleus of an atom