number of protons + number of neutrons
OR
atomic number + number of neutrons
What is an ion?
A charged atom.
What are valence electrons?
Electrons that are found in the outermost energy level of an atom.
Which particles are found in the nucleus?
protons and neutrons
Which type of atoms are shiny, good conductors, and found to the left of the staircase?
metals
How is the number of protons for an atom determined?
Look at the atomic number on the periodic table.
Which atom has a greater atomic radius- arsenic or bromine?
arsenic; it is farther left that bromine
Explain how to write an abbreviated electron configuration.
Located the noble gas that comes in the period before the desired atom, write its symbol in brackets, and count/summarize each orbital section until finished.
What is the name for the group 1 elements?
Alkaline Metals
Which types of atoms are poor conductors, dull, and found to the right of the staircase?
nonmetals
Draw a Bohr model for an atom of Na-23.
See instructor drawing. (11 protons, 12 neutrons, 11 electrons, 3 electron shells-2 electrons in shell 1, 8 electrons in shell 2, and 2 electrons in shell 3)
In which orbital block is tin found?
p
What is the charge of an electron?
-1
What is the name for the group 2 elements?
Alkaline Earth Metals
Which isotope is represented by the Bohr model in the picture. Give the symbol and mass number for the isotope.
Mg-24
What is an isotope?
Atoms of the same element with different masses.
What are the smaller particles called that make up both protons and neutrons?
quarks
What is the name for group 18 elements?
Noble Gases
Which particles are found in the cloud that surrounds the nucleus?
electrons
What does the term "cation" mean?
A positively charged atom that has lost electrons.
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