Which of these is the correct electron configuration notation for a calcium ion?
• 1s 2s 2p 3s 3p6
• 1s²2s22p63s 3p 4s24p6
• 1s²2s22p 3s 3p 4s?
• 1s²2s 2p 3s 3p 4s

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