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Atom X has 8 protons. How many electrons does that atom have? Why?
8 electrons because in an atom the number of p equals to the number of e
What is strange about the placement of hydrogen in the periodic table?
It is nonmetal but is located in the same group of metal (alkali).
Choose the one that doesn’t belong (H B Na). Justify your reasoning.
B (it is in group IIIA while the others are in group IA)
Choose the one that doesn’t belong (Pb K Cu). Justify your reasoning.
Pb (it is in period 6 while the others are in period 4)
Choose the one that doesn’t belong (At Si Ti). Justify your reasoning.
Ti (because it is metal while the others are metalloids )
I am a gas. I am in the Noble Gas family and row 1. I have only 2 valence electrons. I glow red-orange in an electric field. I can also be found in the Sun. Who am I?
Helium (He)
I am a metalloid. I am in the Nitrogen family and row 4. I have an atomic mass of 74.92. I can be used as a poison. Who am I?
Arsenic (As)
I am a nonmetal. I am in the Oxygen family and row 3. I have 6 valence electrons. I am yellow and have a stinky smell. Who am I?
Sulfur (S)
I am a metal. I am in the Carbon family and row 5. I have 50 protons. I am widely used in food packaging. Who am I?
Tin (Sn)