How and Why Study Matter?
This is anything that takes up space and has mass.
What is matter?
On Earth, about ____ elements occur naturally.
What is 90?
These two particles are found in the nucleus of an atom.
What are protons and neutrons?
Electrons are transferred in this type of bond.
What is ionic?
Give the correct formula for calcium fluoride.
What is CaF2?
Matter that has a definite composition and cannot be separated by filtration, boiling, or other physical means.
What are pure substances?
Mendeleev, the man who played "chemical solitaire" to come up with the first periodic table, was from this country.
What is Russia?
This can hold up to two electrons.
What is the first energy shell?
Ionic compounds have positive and negative ions arranged in repeating patterns called this.
What are lattices?
Name this formula: Al2O3.
What is aluminum oxide?
Density is one of this kind of property.
What is physical?
The most important feature of Mendeleev's periodic table was this.
What is its ability to predict undiscovered elements?
In a Bohr diagram, these are used to show that it is the diagram of an ion, instead of an atom.
What are brackets and an ion charge (at top right)?
A particle made of two or more atoms bound together by covalent bonds is called this.
What is a molecule?
Name this formula: SnS2.
What is tin (IV) sulfide?
When one or more pure substances interact to form a different substance or substances.
What is a chemical reaction?
The horizontal rows on the periodic table are called this.
What are periods?
Atom size, measured with atomic radius, increases as we go down a family on the periodic table because of this.
What are additional energy shells?
Compounds are formed because atoms want to do this.
What is become stable?
What is the formula for lead (IV) acetate?
What is Pb(CH3COO)4?
Substances made of one kind of atom that cannot be broken down by chemical means.
What are elements?
The second-most reactive metal family is called this.
What is alkaline-earth metals?
Sodium (period 3, group 1) is more reactive than magnesium (period 3, group 2) because of this.
What is, it has fewer valence electrons to lose?
Covalent compounds are used as insulating covers for computer cables because of this property they share.
What is they are poor conductors of electric current?
N2O5 is the formula for which compound?
What is dinitrogen pentoxide?