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Periodic Table
Atom Parts
Vocab Part 1
Vocab Part 2
Etc.
100
How were the elements arranged on Mendeleev's first periodic table?
Atomic Mass
100
How small are atoms?
Too small to be seen by the unaided eye.
100
The smallest particles of an element that have the same chemical properties as the element.
Atoms.
100
A particle with a negative electrical charge.
Electron.
100
True or False? Copper is a metal and is a conductor of electricity.
True.
200
Moving from left to right across the periodic table, how do the elements change?
They change from metals to metalloids, to nonmetals.
200
Where is the densest part of an atom?
Nucleus.
200
The center of an atom, which contains most of the atom's mass.
Nucleus.
200
The number of protons in an atom of an element.
Atomic Number.
200
The elements have the same number of protons, but vary in neutrons which differ its atomic mass....this is called
Isotope.
300
A chart that shows the elements in order of increasing atomic number.
What is the periodic table.
300
The atomic number of calcium is 20. What can you tell me about the atom of this element?
It has 20 protons.
300
A particle that is found in the nucleus of an atom and has no electrical charge.
Neutron.
300
Water is a ______________ that contains two hydrogen atoms and one oxygen atom.
Molecule.
300
What is the formula for atomic mass?
Protons + Neutrons = Atomic Mass
400
Elements on the far right of the periodic table are classified as....
Nonmetals.
400
True or False? The mass of an electron is about equal to the mass of a proton.
False
400
A positively charged particle inside an atom's nucleus.
Proton.
400
Who is known as the "Father of the Periodic Table"?
Dmitri Mendeleev
400
There is an element missing from the periodic table. To the left of this element the atomic mass is 68.2, to the right of this element the atomic mass is 73.4 What could the atomic mass for the unknown element be?
68.3 - 73.3
500
True or False? A metalloid is an element with all the same properties as metals.
False.
500
The sum of an atom's protons and neutrons is its....
Atomic Mass.
500
When the same element has different atomic masses, it is called a(n).....
Isotope.
500
The smallest particle of a compound that still has all the qualities of that compound.
Molecule.
500
How do elements combine to form all types of matter?
Atoms of elements join to form molecules of compounds. Some compounds are collections of atoms held together by their opposite charges. There are over 100 elements, and they can combine in many ways to make up all matter.