On the periodic table, the element “K’ represents Potassium. Potassium has an atomic number of 19. It has an atomic mass of 39.098. The number of protons is equal to the atomic number, so Potassium has 19 protons. To find the number of neutrons in an element, subtract the atomic mass from the atomic number. (39-19). This means that the element K has 20 neutrons. Finally, to find the number of electrons, you just take the atomic number, and you have your number of electrons. Thus, Potassium has 19 electrons.
The tricks above work for any element on the Periodic Table, so feel free to use them! Here is a little way to remen then by:
A = P = E M - A = N
—————————————
T R L M T E
O O E A O U
M T C S M T
I O T S I R
C N R C O
S O N
# N # S
S
I really hope this helps :)
100 Joules have been used to roll the object up the ramp, but only 90 Joules were actually needed to lift the object, this means that 10 Joules have been wasted in the form of heat due to the friction between the object and the ramp, and this corresponds to
so, 10 % of the energy.
The balanced chemical equation would be written as follows:
Na + Cl2 = NaCl2
We are given the amount of sodium to be used in the reaction. This will be the starting point of the calculation. The ratio of the reactants is 1 mole is to 1 mole. Therefore, we need an equal amount of 4 moles of Cl2 gas to completely react with the sodium metal.
- authoritative but fair
- listens to the people and considers their ideas and needs
- appear powerful but involved and kind
- goal is to maintain peace and care for the nation
- someone with credibility