chemsitry Flashcards
(17 cards)
What is physical properties?
a material that can be measured without changing the state of it
Are protons and electrons the same shape
no
example of a chemical change
Burning, cooking, rusting and rotting
example of physical change
Crumpling a sheet of aluminum foil.
Melting an ice cube.
Casting silver in a mold.
Breaking a bottle.
Boiling water.
Evaporating alcohol.
what does A Z & X stand for
A= mass Z=atomic no. X= Element
what is a isotope?
same protons but different neutrons
example of isotope?
H1 H2 H3
1 1 1
Explain electronegativity?
how strong/close an atom pulls an electron
Explain ionisation energy
the energy required to remove an electron
valence electron
electron in the outer valence shell
what is the most electric element on the table?
fluorine
Why is helium considered non-reactive?
holds the maximum number of valence electron
what is it called when an element gains a charged? +1
ion
what side is non- metals found?
right side
chemical properties of non-metals
gains e
why doesn’t hydrogen fit in the first column
H can gain or lose electrons and become stable and other elements will not be stable if they gain. That’ s why people believe it should be in the noble gass section
atomic number
protons + electrons
