Explain the difference between class characteristics and individual characteristics. name four class characteristics of fired bullets that you could use a difference in the class characteristic to eliminate an item. name three different class characteristics of fired cartridge cases that you could use a difference in the class characteristic to eliminate an item.

Which pair below describes isotopes of the same element? a) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons b) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons c) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons d) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons