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1. How do you determine valence number using the periodic table?


2. Valence electrons are located in the __________ energy level and are important for __________.


3. The __________ rule states that atoms gain/lose electrons to have an electron configuration (s^2p^6) like the __________ __________.


4. What is the valence number for:
a) Barium
b) Selenium


5. What do Ba and Se do to fulfill the octet rule?
a) Barium
b) Selenium


6. What ions do Ba and Se form?
a) Barium
b) Selenium


7. Ionic bonds form when metals __________ electrons to nonmetals. The ions bond due to electricostatic __________.​

1 How do you determine valence number using the periodic table 2 Valence electrons are located in the energy level and are important for 3 The rule states that class=

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