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What atom has the electron configuration: 1s22s22p63s23p6?

Write the chemical formula for a compound made from calcium and the phosphate polyatomic ion. [red7] Name the compound  [red8] Is it an ionic or molecular compound?  [red9]

Determine the electronegativity difference between each pair of atoms and identify the resulting bond type (nonpolar covalent, polar covalent, ionic).                                                 EN Difference                                    Bond Type   C and O                          [bart1]                                     [bart2]   Be and F                         [bart3]                                     [bart4]   N and N                          [bart5]                                      [bart6]

Cold water can dissolve more CO2 than warm water.

How many significant figures are in each number? 1.05  [Faye4] 9500  [Faye5] 0.0004505  [Faye6]

Which statement is true with regard to latitude and longitude?

Which of the following was part of the racial caste system that oppressed and controlled Blacks in the South prior to the Civil Rights Movement?

Continental shelves can be made of granitic crust, basaltic crust, or both.

The mid-ocean mountains, such as the ridges and rises, are ____.

​Which voyage was the first expedition devoted purely to marine science?