Atoms Flashcards
An __ is the basic building block of all matter?
atom
An atom’s nucleus is made of particles with ___ charges called ___ and particles with neutral or no zero charges called ___
1.positive +
2.Protons
3.Neutrons
Quarks are the ___ of matter found in protons and neutrons
building blocks
Atoms have particles with ___ charges called ___which are found at ___ or ___ in the ___ that surrounds the nucleus.
1.negative -
2.electrons
3.different energy levels
4.orbitals
5. electron bond.
Every atom had a certain arrangement of electrons in energy levels called an ___
Electron Configuration
___ electrons are found in the outermost energy level. The number corresponds to the number of the Main Group or Column on the periodic table. Elements in the same group have the same number of valence electrons. For example, all group 1 elements have 1 valence electron.
Valance
The first energy level holds _ electrons
1
The second energy level holds __ electrons
8
The third energy level holds __ electrons
18
A column on the periodic table is called a __. There are ___
1.Group
2.18
A row across the period table is called a __. There are __
1.Period
2.7
In the modern day periodic table, the ___ are arranged by ___ atomic number — not atomic mass—and by periodic changes in ___ and ___ properties
1.Elements
2.Increasing
3.Physical
4.Chemical
___, a Russian Chemist, first presented a way to organize all the known elements
Dmitri Mendeleev
Each element is represented by a ___, which is usually the first one or two letters of their name, with the first letter always capitalized.
Symbol
The ___ (whole #) = # protons = # electrons
Atomic
The ___ (decimal #) = #protons + #neutrons in the nucleus
Mass
___ are atoms with the same number of ___ but different number of ___ and therefore, a different ___. This is why the ___ is a decimal number
1.Isotopes
2.protons
3.Nuetrons
4.Mass number
5.Mass number
Adding or removing ___ to an element creates isotopes of that element so some elements can have different numbers of neutrons for each isotope
neutrons
Adding or removing ___ from the nucleus of an atom creates a different element
Protons
Adding or removing ___ from an atom does not change which element it is. Only the net charge on the atomic atom does.
electrons
Most of the elements in the periodic table are classified as ___
Metals
The elements that fall along the staircase are classified as ___
metalloids
The elements in the far upper right corner are classified as ___
non-metals
The ___ and ___ are at the bottom of the periodic table and are pulled simply to keep the table from becoming too long
1.lanthinides
2.actinides
