The building blocks of matter are called _______________
atoms
100
The number of protons is always equal to the number of
________________________
electrons
100
The vertical columns are called _________________________
groups
100
Who created the Periodic Table Of Elements?
Dimitri Mendelev
100
Name one element that reacts similarly to nitrogen.
phosphorus, arsenic, antimony
200
The nucleus of a atom is made up of _______________ and ____________________.
protons and neutrons
200
Explain how to calculate the number of neutrons in the nucleus of an atom.
The number of neutrons equals:
atomic mass - the # of protons
200
There are ________ groups on the Periodic Table of Elements.
18
200
Elements that are in the same group
have similar chemical properties
200
Are most of the elements in the periodic table metals or non metals?
Metals
300
________________________ are neutral and have no charge.
Neutrons
300
The number of protons and the number of electrons is also equal to the _________________ number for an element on the Periodic Table.
Atomic number
300
The horizonatal rows are called ___________________
periods
300
Identify one element that has similar chemical properties to the chemical properties of boron.
gallium, indium, aluminum
300
The elements fluorine, chlorine, bromine and iodine are all found in the same group on the periodic table because they
a) are metals b) are noble gases
c) react in similar ways d) have the same atomic mass
c) react in similar ways
400
A model is used to ___.
explain atoms that are too small to see.
400
A substance that can not be broken down in to a simpler substance is a (an)
element
400
Atomic number is equal to the number of _______________ in the nucleus of an atom of a given element.
protons
400
What is special about the Noble Gases?
they do not easily combine with other elements to form new substances.
400
______________________________________ is the table that organizes all of the known elements
The Periodic Table Of Elements
500
__________________ are found revolving around the outside of the nucleus ands have a negative charge.
electrons
500
Explain why the overall charge of an atom is zero.
The number of positively charge protons always equals the number of negatively charges electrons.
500
Which group are the Noble Gases in?
Group 18
500
H2O is not found on the Periodic Table of Elements because it is a (an)
compound
500
Elements that have properties both similar to metals and non-metals are called ____________________.