A positively charged atom that has lost electrons.
In which orbital block is tin found?
p
What is the name for group 18 elements?
Noble Gases
What does the group number tell about an atom?
The number of valence electrons present.
What is the name for the group 2 elements?
Alkaline Earth Metals
What is the most common isotope for the following atom. Explain how you know.
Na-23; The average atomic mass is 22.9, which would round to 23. Sodium is most commonly found with a mass of 23.
What is the charge of an electron?
-1
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)
What is the name for group 17 elements?
Halogens
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 are valence electrons?
Electrons that are found in the outermost energy level of an atom.
What is the charge of a proton?
+1
What is the charge of a neutron?
0 (neutral)
Which particles are found in the nucleus?
protons and neutrons
What is an ion?
A charged atom.
Which type of atoms are shiny, good conductors, and found to the left of the staircase?
metals
What is unique about the elements in group 18?
They have 8 valence electrons, so they are stable and will not readily form bonds with other atoms.
What are the smaller particles called that make up both protons and neutrons?
quarks
How is the number of protons for an atom determined?
Look at the atomic number on the periodic table.
What is a row on the periodic table called?
period
How is mass number for an atom determined?
number of protons + number of neutrons
OR
atomic number + number of neutrons
What is an isotope?
Atoms of the same element with different masses.
How many electrons can fit into the following energy levels (shells): 1, 2, 3?
1- two electrons
2- eight electrons
3- eight electrons
Which atom has a greater atomic radius- arsenic or bromine?
arsenic; it is farther left that bromine
What is the name for the group 1 elements?
Alkaline Metals
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