Answer:
For example, atoms in Groups 1 and 2 have 1 and 2 valence electrons, respectively. Atoms in Groups 13 and 18 have 3 and 8 valence electrons, respectively. Valence electrons are responsible for the reactivity of an element. They determine how "willing" the elements are to bond with each other to form new compounds.
Explanation: it might be 18 my guess:)
Answer:
4.9 x 10²²hockey pucks
Explanation:
Given parameters:
Number of moles of hockey = 0.0814moles
Unknown:
Number of pucks there = ?
Solution:
A mole of a substance is made up of Avogadro's number of particles.
Therefore;
1 mole of hockey pucks will contain 6.02 x 10²³ hockey pucks
0.0814 mole of hockey pucks will contain :
0.0814 x 6.02 x 10²³ = 4.9 x 10²²hockey pucks
Answer: energy of infrared radiation=13.75×10^-20J
Energy of ultraviolet radiation=8.5×10^-19J
Energy of xrays=3.7×10^-17J
Explanation:
Energy of radiation= h×c/wavelength
h=6.6×10^-34 Js
c=3×10^8 ms-1
For infrared= 6.6×10-34×3×10^8/1.44×10^-6=13.75×10^-20J
For ultraviolet= 6.6×10^-34 × 3×10^8/233×10^-9=8.5×10^-19J
For xrays= 6.6×10^-34×3×10^-8/5.34×10-9=3.7×10^-17J
Answer:
Sodium fluoride is a colorless crystalline solid or white powder, or the solid dissolved in a liquid. It is soluble in water. It is noncombustible.(I got this answer from g o o g l e)
Explanation:
They have different number of Neutrons and protons, so their masses are different
Hope this helps!