A. Use the periodic table to answer the following questions about calcium (Ca). (8 points)
1. What is its atomic number? (2 points)
ii. What is its average atomic mass? (2 points)
iii. How many neutrons does the isotope Ca-42 have? (2 points)
iv. What family does it belong to? (2 points)

The peak wavelength for the blackbody curve of a star is in the uv range. assuming the radiation from this star can reach earth, would you be able to see it?

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?