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Unit 3 The Atom
Terms in this set (40)
smallest particle of an element that has the properties of the element
Atoms are incredibly tiny measured in ____________________. Nucleus is tiny compared to the atom.
contains protons and neutrons; positive charge; almost all the mass.
most of the volume of an atom; the region where the electron can be found
Has a mass of 9.11x10 (-28)g. This is so small that we say the electron has ________ ______________.
Electrons are found "swarming" in different levels known as _________________ around the nucleus. They have a charge of _______
Positively charged subatomic particles make up of quarks. have a charge of +1. found in nucleus. mass is 1.6726x1- (-27)kg about 1,836 times the mass of an electron
subatomic particles with no charge. mass slightly larger than a proton. made up of quarks. Also found in nucleus.
The number of protons in each atom of that element. represented by the symbol Z
atomic number; electrons
The elements of the periodic table are put in order of ______________ _________________. Since atoms are neutral, an elements atomic number is also it's number of _______________.
The total number of _________________ and _____________________. uses the symbol A
______________________ identifies the element
The number of _______________________= the number of electrons in a neutral atom
the count of protons and neutrons
Elements can have different mass numbers because of differing numbers of _____________________
atoms of the same element that have different masses (different number of neutrons). All isotopes have the same number of protons and electrons.
name; atomic number; mass
Identifying isotopes requires knowing both the _______________ or _______________ ______________ of the element and ________________ of the isotope.
a count of the total number of protons and neutrons in the nucleus of an atom in AMU
- this is the atomic mass rounded to a whole number
Mass number - Atomic number = # of _____________________
average atomic masses
This is the weighted average of the atomic masses of the naturally occurring isotopes of an element.
The __________________ of each isotope of an element is always the same, no matter where the element is found on Earth.
average atomic mass
You will notice that the atomic masses given for each element on the periodic table is the ____________________ __________________ _____________
Each isotope has its own _____________ __________; we need the average from percent abundance in order to calculate.
atoms that have a charge due to atoms losing or gaining electrons when bonds are formed.
positively charged ions; formed when atoms lose electrons; the atom becomes more positive
negatively charged ions; formed when atoms gain electrons; the atom becomes more negative
energy levels; regions
Bhor assigned "________________ _________________" to _____________ around the nucleus (which corresponded to amounts of light energy he measured)
His model was the first atomic model of the atom that helped to explain the __________________ of _____________.
Suggested electrons "jump" between energy levels in a quantum fashion ... _____________________
Lowest energy nearest the nucleus
absorb; excited state
Electrons ________________ energy, and move outward to higher energy levels (____________________)
light; fall back
the energy is released in the form of ________________, as the electrons __________ _______________ from their "excited" state back into their "ground" states.
a small, specific amount of energy that is lost or gained by an atom as an electron moves to a higher or lower energy level.
When an electron is ________________, by heat or electricity, it absorbs energy and jumps to a higher energy level.
When the electron jumps down to a lower energy level it gives _________ ________________ in the form of light.
bright line spectra
The colors given off are called the _______________ _______________ __________________; it acts as a finger print for the element.
Each element gives off only certain frequencies of light, called ________________ __________
in effect each element has its own ___________________ of spectral lines allowing us to identify which element we have or what stars are made of.
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