physics

Nucleus

the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.

responsible for radioactive decay

weak force

strong force

(physics) the interaction that binds protons and neutrons together in the nuclei of atoms

weak force

A force that is associated with nuclear decay and is one of the four fundamental forces

isotope

Atoms of the same element that have different numbers of neutrons

which fundamental force keeps electrons in orbit around the nucleus?

Electrons are kept in the orbit around the nucleus by the electromagnetic force

describe the arrangement of electrons in an atom, why is this arrangement so important?

Electrons move around the nucleus in electron shells. electrons closest to the nucleus have a lower energy level. this is important because it displays energy levels and atomic orbits.

how is the electromagnetic force different than the two other fundamental forces?

The electromagnetic force keeps electron attached to the atom. The strong force keeps protons and neutrons together. and the weak force controls how the atom decays.

electromagnetic force

a force associated with charged particles, which has two aspects, electric force and magnetic force

subtomic particles

a particle smaller than an atom example: neutron

electron cloud

a region around the nucleus of an atom where electrons are likely to be found

energy level

a region of an atom in which electrons of the same energy are likely to be found

atomic mass unit

a unit of mass that describes the mass of an atom or molecule

which two forces are responsible for holding atoms together?

electromagnetic and a strong force.

exerts a force of attraction between all objects in nature

gravity

is most easily observed in the behavior of large objects

gravity

which fundamental force is weakest?

gravity

What is different about the atoms of n-14 and n-15?

n-15 has 15 neutrons, n-14 has 14.

why does the nucleus account for 99.9% of the mass of an atom?

nuclei are composed of only neutrons and protons, both of which have a mass of 1. electrons orbit shells outside of the nucleus and have a mass of 1/2000 so their combined masses are so small that most (99.9% give or take) of the mass is contained in the nucleus

Holds protons together in the nucleus

strong force

Opposes the electromagnetic force in the nucleus

strong force

Which fundamental force is the strongest?

strong nuclear