Measurements
How many fingers is 6 milliliters
3
In the center of an atom with a positive charge
how many groups are there?
18
what is ionic bonding?
when a nonmetal and a metal exchange electrons
What is synthesis reaction?
when two different atoms or molecules interact to form a different molecule or compound
what is physical change?
doesn't change substance but can change physical properties
what are electrons?
circle the center of an atom, has a negative charge
What is the last element on the periodic table? (# and name)
Oganesson #118
what is a covalent bond
when two nonmetals share an electron
What is decomposition reaction?
when a compound breaks down into 2 or more simpler substances
what is a chemical change?
A change in substance
what do atoms make?
elements
What is the 63 element on the periodic table
Europium
What is chemical bonding?
a lasting attraction between atoms, ions, or molecules
what is double replacement reaction?
parts of two ionic compounds are exchanged, making two new compounds.
what is accuracy?
refers to the closeness of measured value to a standard or known value
what three forces hold an atom together
electromagnetic force, strong nuclear force, and weak nuclear force
Dmitri Mendeleev
What is the strongest bond?
Covalent
what is single replacement?
a reaction in which one element is substituted for another element in a compound.
what is precision?
refers to how close two or more measurements are to each other
how many different atoms are there?
It's an ugly number
When will you use the periodic table outside of science?
in any everyday job
a weak bond between two molecules involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons is what kind of bond?
A hydrogen bond
what is combustion reaction?
a reaction in which a substance reacts with oxygen gas, releasing energy in the form of heat and light.