The correct option is 3; ELECTRONEGATIVITY INCREASES AND ATOMIC RADIUS DECREASES.
Electronegativity refers to the tendency of an atom to attract a shared pair of an electron to itself. When one is moving across period 2 of the periodic table from left to right, the elements on the left are metals while those on the right are non metals. Thus, the metals has low electronegativity values, while the non metals have high elelctronegativity values.
Atomic radius refers to the measurement of the size of an atom. As one moves across period 2, there is a decrease in the atomic radii of the element. For instance, the atomic radii of the elements as one move from lithium to neon are: 152, 112, 88, 77, 70, 66, 68 and 67.
Answer:
5.01 moles
Explanation:
Calculate the number of moles in 400g of Tio2
first, write the formulas correctly
Calculate the number of moles in 400g of TiO2
capitalize the first letter of your elements
the molar mass of TiO2 is
47.88 +2X16.00 =47.88 +32.00 = 79.88 gm/mole
(to 3 sig fig = 79.9 gm/mole
400 gm/79.9 gm/mole = 400/79.9 mole gm/gm =
400/79.9 moles = 5.01 moles
Answer:
Dobereiner could identify only three triads. He was not able to prepare triads of all the known elements. All the known elements could not be arranged in the form of triads. For very low mass or for very high mass elements, the law was not holding good.
A Polymer is a substance which has a molecular structure built up mainly or completely from a large number of similar units bonded together, e.g. Many synthetic organic materials used as plastics and resins.
Sorry for the delay! My internet is a bit bad.
P is the third sublevel. Each sublevel (the angular momentum quantum number), has its own number:
<span>s = 1, p =3, d = 5, f = 7</span>
The number of electrons for each is:
s-2
p-6
d-10
f-14
It's easier to just memorize these numbers, but the equation for determining the sublevel number is 2n (n = the principal quantum number). The principal quantum number is based on the period the element is in.
