Vocabulary 1
What is an atom?
the smallest particle of an element that retains the element's properties
What are quarks?
Protons and neutrons are composed of smaller particles
What is the average atomic mass?
the weighted average mass of all naturally occurring isotopes of an element measured in atomic mass units
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Boron
Pt
Platinum
Hydrogen is found in what energy level
Energy level 1
What is a nucleus?
the small positively charged center of the atom
What is an electron cloud?
An area around the nucleus of an atom where electrons are most likely to be found
What is the Periodic Table?
Elements are arranged by increasing atomic number
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Carbon
Ag
Silver
Mass Number 20
Neon
What are protons?
particles with an electric charge of 1+
What is atomic number?
The number of Protons in an atom's nucleus is equal to its
What are periods?
The horizontal rows of elements in the periodic table
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Oxygen
O
Oxygen
Atomic Number 13
Aluminium
What are neutrons?
electrically neutral particles in the nucleus
What is mass number?
the sum of the number of protons and the number of neutrons in the nucleus of the atom
What are groups?
The vertical columns in the periodic table
23
Sodium
Au
Gold
How many Neutrons are in the element Potassium (K)
20
What are Electrons?
particles with an electric charge of 1-
What is an isotope?
Atoms of the same element that have different numbers of neutrons
What is the electron dot diagram?
consists of the chemical symbol of an element surrounded by dots to represent the number of electrons in the outermost energy level
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Copper
Kr
Krypton
A Russian Chemist that presented a way to organise all the known elements
Dmitri Mendeleev