it is tecnically magnesium,
1 mole = 70.9
X mole = 140
X=1.9746 moles
X= 1.98 when rounded to 3 significant figures.
As you know, an element'svalence electrons are simply theelectrons located on the outermost energy level, i.e. on thehighest occupied energy level. Therefore, you can say that anelement located in group 5A has 5 electrons on its highest occupied energy level. so the answer would be c.5
Hg<span> is the modern </span>chemical symbol for mercury<span>. It comes from hydrargyrum, a Latinized form of the Greek word ὑδράργυρος (hydrargyros), which is a </span>compound<span>word meaning "water-silver" (from ὑδρ- hydr-, the root of ὕδωρ, "water," and ἄργυρος argyros "silver") – since it is liquid like water and shiny like silver.</span>
The angle made by electric field with the magnetic field in an electromagnetic wave is 90° or right angle.
<u>Explanation:</u>
The electrical & magnetic fields are at the 90 degree i.e at the right angles to the way the wave travels. The electric field oscillates back and forth in one plane while the magnetic field oscillates back and forth in a perpendicular plane;
the vibration, a transverse vibration, moves in a similar direction of each of the oscillating fields. All electromagnetic waves are created by accelerated charges, and the electromagnetic force follows the inverse-square law; the magnitude of the force declines as one above the squared source distance.
