Answer:
Good Question
see Negative ions are those which gain electrons to attain stability
Now, We know All metals tend to donate electrons which inturn results in positive charge
Now Have a closer look at options
a) F
It is fluorine
it's configuration is 2,7
that means it requires one electron to complete it's octet from 7 to 8
therefore, it will gain one electron which results in
b)Li
lithium is metal having one electron in outermost shell So it will rather loose electron to attain stability
c)Ne
Neon is Noble gas which exists in neutral stare
d)S
Sulphur needs 2 more electrons to attain stability
therefore it exists as negative ion
e)Al
Aluminum is metal So it exists as positive ion
f)Be also exists as positive ion
Answer:
ν = 5,765x10¹⁴ Hz
λ = 520 nm
230,0 kJ/mole
Explanation:
To convert energy yo frequency you need to use:
E = hν
Where E is energy (3,820x10⁻¹⁹ J)
h is Planck's constant (6,626x10⁻³⁴ Js)
And ν is frequency, replacing ν = 5,765x10¹⁴ s⁻¹ ≡ 5,765x10¹⁴ Hz
To convert frequency to wavelength:
c = λν
Where s is speed of light (2,998x10⁸ ms⁻¹)
ν is frequency (5,765x10¹⁴ s⁻¹)
And λ is wavelength, replacing: λ = 5,200x10⁻⁷ ≡ 520 nm
If 1 photon produce 3,820x10⁻¹⁹ J, in mole of photons produce:
3,820x10⁻¹⁹ J ×
= 230040 J/mole ≡ 230,0 kJ/mole
I hope it helps!
Answer:
Most similar - Lithium
Least similar - Phosphorus
Explanation:
Rubidium is an element in group 1A of the periodic table. It is a metal and forms an ionic compound with chlorine. The formula of the compound is RbCl.
If we look at the options, Lithium is also a group 1A element and forms an ionic compound with chlorine having the formula LiCl which is very much similar to RbCl chemically.
Phosphorus is a nonmetal. Its compounds with chlorine, PCl3 and PCl5 are covalent and does not resemble RbCl in any way.
D) 710 g
Step by Step:
Multiply 2.5 L by 2.0 M to solve for moles
2 mol/L • 2.5 L= 5 mol
Find formula weight of sodium sulfate
Na2SO4-142.04 g/mol
Na- 2(22.99)=45.98
S-32.06
O-4(16)=64
Multiply miles by formula weight
5 mole • 142.04 g/mol=710.2 g
