The abbreviation Al, with one dot on top of the abbreviation, one on the left, one on the right.
Answer:
See explanation
Explanation:
We can describe electrons using four sets of quantum numbers;
principal quantum number (n)
orbital quantum number (l)
magnetic quantum number (ml)
spin quantum number (ms)
Since no two electrons in an atom can have the same value for all four quantum numbers according to Pauli exclusion theory, for the orbitals given one possible value for each quantum number is shown below;
For 1s-
n = 1, l= 0, ml = 0, ms= 1/2
For 2s-
n= 2, l =0, ml=0, ms=1/2
For 1s and 2s orbitals, there is only one possible value for ml which is zero.
Answer:
Periods on the periodic table of elements
Explanation:
In the periodic table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families. (See also The Periodic Table: Metals, Nonmetals, and Metalloids.) In each period (horizontal row), the atomic numbers increase from left to right.
Answer:
0.5kg
Explanation:
Given parameters:
Speed of the object = 12m/s
Kinetic energy = 36J
Unknown:
Mass of the object = ?
Solution:
Kinetic energy is the energy due to the motion of a body. It is mathematically expressed as;
K.E = 
m v²
Insert the parameters and solve;
36 = x m x 12²
36 = 72m
m = 0.5kg
3.59 mol
1.836 x 10 ²⁵ molecules
<h3>Further explanation</h3>
Given
230 g SO2
30.5 moles LiNO3
Required
moles and molecules
Solution
mol = mass : molar mass
1 mol = 6.02 x 10²³ particles(molecules, atoms, ions)
1. 230 g x 1 mol/64,066 g =3.59 mol
2. 30.5 moles x 6.02 x 10 ²³ molecules / 1 mol = 1.836 x 10 ²⁵ molecules
