Additional Science - Chemistry

Frage	Antworten
Mendaleev organized elements according to what?	Their Atomic Mass (bigger number)
Why did Mendeleev leave gaps in his model of the periodic table?	Because he had predictions as to what undiscovered element would fit there.
What is an atom?	The smallest part of an element.
What particles are in an atom (subatomic particles)?	Protons (+) & Neutrons ( )
Which subatomic particle has the smallest mass?	Electron (1/1840) (negligible)
Where is most of the atom's mass found?	In the Nucleus
What is the mass number?	number of protons + neutrons (bigger number)
What is the atomic number?	number of protons (smaller number)
What is relative atomic mass	measured by the standard Carbon atom (12)
What makes an Isotope	a difference in neutrons
What is an electron configuration	the way electrons are arranged i.e. 2,4,2
What is an Ion	an atom or group of atoms with positive or negative charge
What is a Cation	a group of positively charged ions
What is an Anion	a non-metal gains electrons to form a negatively charged anion.
What happens in Ionic Bonding	Transfer of electrons to become positively/negatively charged
What is the ideal number of electrons in the outer shell?	8
Na2O means what	that there are two sodium atoms for each oxygen one
What is a lattice structure	an arrangement of ionic compounds i.e. box-like crystals
Ionic Compounds usually end in what?	-ate / -ide
What are lattices held together by	Strong electrostatic forces
What determines solubility?	How easily a substance dissolves in a particular liquid
A salt is created how?	by reacting an acid & alkali
What is a precipitation reaction	soluble + soluble = insoluble
What does (aq) stand for	aqueous solution - dissolved

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Additional Science - Chemistry

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