Chemistry

the building block of all matter

a molecule is a number of atoms bonded together while a compound is two or more different atoms bonded together

An isotope is when atoms of the same element contain the same number of protons but different number of neutrons

alpha, beta and gamma

Emits a helium nucleus is a particle has a positive charge moves relatively slowly is large low penetrating power ( paper stops it)

emits an electron is a particle negative charge moves fast (99% of speed of light) is small medium penetrating power ( stopped by plastic)

is a wave, only energy no charge speed of light very small high penetrating power (stopped by a thick layer of concrete or lead)

Radioactive decay is when the nucleus of an unstable isotope releases energy by emitting radiation

To become more stable

groups are x value and periods are y value

how long it takes for half of a radioactive atom to decay

a positive version of an atom that has lost electrons

Radiotherapy to treat cancer X-rays used in medical imaging

a charged version of an atom that has either lost or gained electrons

to become stable with a full outer shell of electrons

a negative version of an atom that has gained electrons

they end in ‘ide’ eg. nitride

below 7 are acids, above 7 are bases/alkalis and 7 is neutral

matter can neither be created nor destroyed

salt and water

salt and hydrogen (H^2)

salt + water + CO2

when an acid reacts with a base

hydrogen. helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon