To make a stable ionic compound you need 8 valence electrons and since nitrogen has 5 valence electrons he would need 4 more ions of Elements to make a full 8,
Answer: 2.75×10^-7m
Explanation:
The work function refers to the smallest energy a photon must posses in order to cause the ejection of electrons from a metal surface.
If Eo= hfo
Eo=work function of the metal
fo=threshold frequency
h= Plank's constant
But Eo= hf= hc/wavelength
Wavelength= hc/Eo
We convert Eo to joules
4.50×1.6×10^-19=7.2×10^-19J
c=3×10^8ms-1
h=6.6×10^-34Js
Wavelength= 3×10^8×6.6×10^-34/7.2×10^-19
2.75×10^-7m
Answer:
<u>2</u> NaBr + <u>1</u> Ca(OH)2 ---> <u>1</u> CaBr2 + <u>2</u> NaOH
<span>Elements must be heated before they emit colored light because the heat being added to the elements will allow for a reaction to happen between the element and the oxygen in air. They are endothermic reactions where energy is needed in order for the reaction to proceed.</span>