Explanation:
Noble gases are the gases which are present is group 18 of the periodic table.
(a) Sodium is the alkali metal that has 11 protons as its atomic number is 11. Sodium is present in group 1 and period 3 of the Periodic table. Therefore, noble gas present in period 3 is Argon.
(b) Argon is the noble gas that has 18 electrons and it is present in period 3. Hence, alkaline earth metal that is present in period 3 is magnesium.
(c) Manganese is the element that has atomic number (or protons) equal to 25 and its atomic mass (total protons + total neutrons) equal to 55. Manganese is present in period 4 and noble that is also present in period 4 is krypton.
(d) Gold is the element that is present in period 6. And, a noble gas which is also present in period 6 is Radon.
The threshold frequency of Cesium is 5.2 x 10^14 Hz.
To find the frequency of yellow light, we use the equation:
speed of light = wavelength x frequency
3 x 10^8 = 5.8 x 10^-17 x frequency
frequency = 5.17 x 10^24
This is higher than the threshold frequency of Cesium, thus, electrons will be emitted.
Answer:
the conjugate base of the compound is
C6h6O2/6-
Explanation:
subscript
hi there bestie [i think its 3]