Elements review Flashcards
Who is Dmitri Mendeleev?
Russian chemist who organized the periodic table
Why was his contribution valuable to the field of science?
He organized elements into rows by their atomic mass.
How is a chemical symbol written for an element found on the PT?
The first letter is capital, and if there’s a second letter its lowercase.
Hydrogen
H
Sodium
Na
Mercury
Hg
Iron
Fe
How many different types of elements can be found in NaCl, HCl, and NaHCO3?
2, 2, and 4
The majority of the periodic table is made up of _________; however, some of Earth’s elements that exist in living things, oceans, and atmospheres are made up of _____________.
Elements, compounds
What is an element?
A pure substance that can’t further be broken down
Can elements be broken down?
No
Give 3 examples of elements:
Hydrogen, Sulfur, Oxygen
What is a compound?
A mixture of elements that are chemically combined and can be broken down into elements
Can compounds be broken down?
Yes, into elements.
What type of change occurs when elements combine to create a compound?
Chemical change
