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