True or false the nucleus of an atom is made of protons and neutrons

radiowaves in the AM region have frequencies in the range 550 to 1600 kilocycles per second (550 to 1600 kh) calculate the wavelength corresponding to a radio wave of frequency 1.365*10^6A and 1365kh

Are the forces balanced or unbalanced regarding planetary orbit

Which of the following is a product formed when BaO and H2O react together? BaO H2 O2 Ba (OH) 2

Which ion has the same electron configuration as Potassium?

Based on periodic properties, what two or three elements would you expect to be most like carbon?

Organic compounds ALL contain the element carbon. Which organic compound, used for stored chemical energy, contains carbon, hydrogen, oxygen, and often phosphorous?

In a polar molecule, which atom will have the greatest partial negative charge? A) the smallest atom B) the least electronegative atom C) the largest atom D) the most electronegative atom

Why is portion control important

Which ionic compound is the most likely to dissolve in water? CaSO4 Na2SO4 BaSO4 SrSO4

Calcium (atomic number 20) has electron configuration 1s2,2s2,2p6,3s2,3p6,4s2. The atomic number of scandium is 21. Which orbital does the 21st electron enter? a. 3d b. 4p c. 4d d. 4f