Atomic Structure and the Periodic Table Flashcards
Define the term “Molecules”.
Any element chemically joined, even if they’re the same Element.
What did the Plum-pudding model show?
Ball of positive charge containing negative electrons scattered around.
How was the nuclear model discovered?
Using the Alpha-Scattering Experiment.
What did the nuclear model state?
Mostly empty space, Positive nucleus (centre), Ring of electrons.
Define “Relative atomic mass”.
average mass numbers of different isotopes, weighted for the abundance of each isotope (how common each isotope is).
Equation for Relative atomic mass.
Relative Atomic Mass = (Mass of isotope 1 x Abundance of isotope 1) + (Mass of isotope 2 x Abundance of isotope 2) / 100
What did Niels Bohr State
Electrons Orbit the nucleus in shells.
What did James Chadwick state
Nucleus contains neutrons
How many electron’s in each shell?
2,8,8,18
When metals react what do they form?
positive ions
what are the group 1 metals called?
alkali metals
what is the reactivity of group 1 metals?
react rapidly with oxygen (more reactive as we move down the group) react with chlorine to form metal oxides.
What do group 7 elements form together?
molecules with two atoms joined by a covalent bond.
What do group 7 elements form when they react with non-metals?
Covalent Compounds.
What do group7 elements form when they react with metals?
Ionic compounds
