The answer would be B, 7 valence electrons. <span>F is located
in the 1s-orbital and the second energy level, which in fluorine's case
is the outermost energy level, meaning it has <span>7 electrons</span></span>
To solve the problem we will use the following equation:
n(Li) = N(Li) / NA
n - the number of moles
N - the number of particles
NA - Avogadro's number that has following value: 6.022×10²³ mol⁻¹
From the upper relation follows:
N(Li) = n(Li) × NA
N(Li) = 1mole × 6.022×10²³ mol⁻¹ = 6.022×10²³ atoms of <span>lithium</span>
Answer:
An EL mechanism
Explanation:
I looked this up, it's called an EL mechanism
The relationship between boiling point of liquid and elevation is inverse. Means, with increase in altitude the boiling point will decrease. This is because with increase in altitude the atmospheric pressure will decrease, as boiling point is temperature at which vapor pressure of liquid becomes equal to the atmospheric pressure.
Hence, the city where boiling point of specific liquid is 141 °C is at higher elevation. And the liquid with boiling point of 145 °C is experiencing higher atmospheric pressure due to less altitude of the city it is present in.