Three isotopes of silicon occur in nature. 28Si (92.23%), which has an atomic mass of 27.976 amu;

29Si (4.68%), which has an atomic mass of 28.976 amu;

30Si (3.09%), which has an atomic mass of 29.973 amu.

Calculate the atomic weight of silicon

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

Which substance has non polar covalent bonds