I can give you four oxygen, selenium, sulfur, talarium hope this helps!
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Answer:
The mass number is defined as the total number of protons and neutrons in an atom. Consider Table below which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.
Explanation:
n = 4 can hold up to 16 electrons
<em>There are 4 sublevels; 42, 4p, 4d and 4f</em>
<u>4s (1 orbital), 4p (3 orbitals)</u>
<u>4d (5 orbitals), 4f (7 orbitals) </u>
<u><em>Maximum number of electrons in energy level: 16</em></u>
s = 1 orbital
p = 3 orbitals
d = 5 orbitals
f = 7 orbitals
Add these up;
1 + 3 + 5 + 7 = 16
MW of gas : 124.12 g/mol
<h3>Further explanation </h3>
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
With the same mass, the volume of objects that have a high density will be smaller than objects with a smaller type of density
The unit of density can be expressed in g/cm³ or kg/m³
Density formula:
ρ = density
m = mass
v = volume
glass vessel wieight = 50 g
glass vessel + liquid = 148 ⇒ liquid = 148 - 50 =98 g
volume of glass vessel :
An ideal gas :
m = 50.5 - 50 = 0.5 g
P = 760 mmHg = 1 atm
T = 300 K