Describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons in the nucleus and electrons in the electron cloud;
Recognize that chemical formulas are used to identify substances and determine the number of atoms of each element in chemical formulas containing subscripts; and
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Q 1/6
Score 0
How many valence electrons are in an atom of each element in Group 15 in the periodic table?
60
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5
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7
Q 2/6
Score 0
A student drew atomic models of four elements. Based on these drawings, which element is the least reactive?
60
Neon, because it has two energy levels with eight electrons in the second level
Gallium, because it has four energy levels with three electrons in the fourth level
Tin, because it has five energy levels with four electrons in the fifth level
Chlorine, because it has three energy levels with seven electrons in the third level
6 questions
Q.
How many valence electrons are in an atom of each element in Group 15 in the periodic table?
1
60 sec
8.5c
Q.
A student drew atomic models of four elements. Based on these drawings, which element is the least reactive?
2
60 sec
8.5b
Q.
3
60 sec
8.5a
Q.
Which statement does NOT correctly compare silicon with another element?
