Which part of an atom has a negative charge? electron neutron nucleus proton

What is the molar mass of ca(cio4)2

Is a pencil falling to the floor anon contact force, a force, or a contact force

He table below gives the atomic mass and relative abundance values for the three isotopes of element m. relative abundance (%) atomic mass (amu) 78.99 23.9850 10.00 24.9858 11.01 25.9826 what is the average atomic mass (in amu) of element m? 2.86 5.36 24.30 24.98