Can Intrusive and Extrusive Igneous rocks form from the same mineral composition?

What semimetal can form four single covalent bonds.

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

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