elements
How many elements are there on the Periodic Table?
118
What subatomic particle has a positive charge?
Proton!
How is the periodic table arranged?
left to right and top to bottom in order of increasing atomic number.
What do you call a substance that speeds up a chemical reaction without being used up in the reaction?
A catalyst is a substance that speeds up a chemical reaction
What is synthetic element?
A synthetic element is one of 24 known chemical elements that do not occur naturally on Earth: they have been created by human manipulation of fundamental particles ina nuclear reactor
How many electrons are in a neutral atom of Oxygen?
8 electrons!
What do the rows on the periodic table represent?
The rows on the periodic table are called periods. All the elements in a period have valence electrons in the same shel
What is the chemical symbol for water?
H20
What is the smallest unit of an element that still retains the properties of that element?
Atom!
What is the central part of an atom called, containing protons and neutrons?
THE NUCLEUS!
Elements in the same __ have similar chemical properties.
SAME GROUP!
Sodium hydrogen carbonate's NaHCO3 common name is?
How many elements are in this compound?
Baking soda
Name an element that is alkali metals, what what is one characteristic about alkali metal?
True or False: The number of protons in an atom is equal to its atomic number.
TRUE!
what are elements used to spell science using periodic table
Sc ( Scandium), Iodine ( I), e- ( electron), N (nitrogen) & Cerium ( Ce)
When iron rusts, is this an example of a chemical or physical reaction?
Chemical Change!
What is the most abundant element in the Earth's atmosphere?
NITROGEN! (78.084%)
nitrogen dilutes oxygen and prevents rapid burning at the Earth's surface. Living things need it to make proteins.
What do you call atoms of the same element with different numbers of neutrons?
What group on the periodic table contains elements known as the "noble gases", and what is the common characteristic of noble gases?
GROUP 18
odorless, colorless, nonflammable, and monotonic gases that have low chemical reactivity
In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed