Which atom has a greater atomic radius- arsenic or bromine?
arsenic; it is farther left that bromine
What is a row on the periodic table called?
period
How is the number of protons for an atom determined?
Look at the atomic number on the periodic table.
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 charge of an electron?
-1
How is mass number for an atom determined?
number of protons + number of neutrons
OR
atomic number + number of neutrons
What is the name for the group 2 elements?
Alkaline Earth Metals
What is the name for group 18 elements?
Noble Gases
What are the smaller particles called that make up both protons and neutrons?
quarks
What is a column on the periodic table called?
group or family
Which particles are found in the nucleus?
protons and neutrons
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.
Which particles are found in the cloud that surrounds the nucleus?
electrons
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.
A positively charged atom that has lost electrons.
Which types of atoms are poor conductors, dull, and found to the right of the staircase?
nonmetals
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 is the name for the group 1 elements?
Alkaline Metals
What is an ion?
A charged atom.
What is the charge of a proton?
+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)
How many electrons can fit into the following energy levels (shells): 1, 2, 3?
1- two electrons
2- eight electrons
3- eight electrons
What are valence electrons?
Electrons that are found in the outermost energy level of an atom.
Which type of atoms are shiny, good conductors, and found to the left of the staircase?
metals
What is the charge of a neutron?
0 (neutral)
In which orbital block is tin found?
p
What does the group number tell about an atom?
The number of valence electrons present.
What is the name for group 17 elements?
Halogens
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