Answer:
Seven
Explanation:
Because all halogens have seven valence electrons, they are “eager” to gain one more electron. Doing so gives them a full outer energy level, which is the most stable arrangement of electrons. Halogens often combine with alkali metals in group 1 of the periodic table.
Answer: Option C and D.
Explanation:
The plastic bottle when rubbed with the piece of felt gets charged due to friction. The electrons transfer from piece of felt to the plastic bottle. Hence, the plastic bottle gets negatively charged and piece of felt gets positively charged. When plastic bottle is brought near to piece of felt, opposite charge is induced to it and it is attracted to the plastic bottle and thus, sticks to it.
For the model, Leah's model would show that felt have fewer electrons than protons as the electrons are transferred to the plastic bottle and hence, it gets charged. The Styrofoam pieces would stick to the plastic bottle. Therefore, the correct options are C and D.
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