Corn Tortillas (2) 120 cal, no fat, no sodium, 26g carbs, 2g fiber, 4g protein. Getting 2 corn tortillas instead of 4 in the tacos is a great way to cut down on calories without feeling like youâre missing out. The nutrition info says thereâs no sodium in them at all, though I wonder if thatâs a typo.
Helium. Helium. A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas.
The nucleus of the helium atom contains 2 massive, positively charged particles. Thus, Z, the atomic number = 2. Z is simply the number of protons, massive, positively charged particles, present within the nucleus. Z thus defines the identity of the element: Z=1, hydrogen; Z=2, helium; Z=3, lithium;.....Z=80, mercury. You do not have to remember these numbers, because in every exam you ever sit you should be provided a copy of the Periodic Table, which lists all the elements in order of atomic number.