All atoms of a given element have the same number of ___
What are protons
100
Atoms with the same atomic number but different mass numbers are ___
What are isotopes
100
Mendeleev realized if elements were arranged in order of increasing ___ ___, elements with similar properties appeared in a regular pattern
What is atomic mass
100
The ___ describes the composition of molecules but gives not structural info, which helps us understand how a molecule can interact with other molecules
What is molecular formula
100
In Group 5A, scientists have long sought ways to make compounds form atmospheric Nitrogen, also known as this
What is Nitrogen fixation
200
This famous scientist changed medieval alchemy to a modern field of study
Who is Antoine Lavoisier
200
___ is the average mass of a representative sample of atoms
What is atomic weight
200
Wavelength in x-rays provides a direct correlation to finding the ___ ___
What is atomic number
200
A ___ formula includes how certain atoms are grouped together
What is condense
200
S, Se, and T are known as ___
What are chalcogens
300
1 atomic mass unit = ? g
What is 1.661 x 10^-24 g
300
The isotope of hydrogen with one neutron is ___
What is deuterium
300
This law is stated as the properties of the elements are periodic functions of atomic number
What is law of chemical periodicity
300
A ___ formula shows how atoms are attached within a molecule
What is structural
300
The names of the bottom two rows of the periodic table
What are lanthanides and actinides
400
Our relative mass is based off of which element?
What is carbon
400
The mass of isotopes and their abundances are determined experimentally using a ___ ___
What is a mass spectrometer
400
These certain elements conduct electricity, are ductile, malleable, and form alloys
What are metals
400
Physical and chemical properties of a molecular compound are related to its ___
What is structure
400
Group 7A elements are all ___
What is diatomic
500
___ said the combo of elements involved atoms and proposed a relative scale of atom masses, based off of hydrogen
Who is John Dalton
500
The atomic weight of an element is always closer to the mass of the ___ abundant isotope or isotopes
What is most
500
This defines a nonmetal that can exist in different forms, each having its own properties
What are allotropes
500
This molecular model is more realistic than ball-and-stick