Explanation:
Sodium and potassium are in the same group on the periodic table because they both have similar number of valence electrons (1 electron) in their shells
Na = 2,8,1
K = 2,8,8,1
Answer:
Mass (m) = 1600 kilogram
Explanation:
m = V × ρ
= 800 cubic meter × 2 kilogram/cubic meter
= 1600 kilogram
Answer:
violet
Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light. Ultraviolet (UV) light—is radiation with a wavelength shorter than that of visible light, but longer than X-rays, in the range 10 nm to 400 .
Explanation:
1 mole of NO2= 7 + (8×2)= 7 + 16 = 23g
81g of NO2 = 81÷23 = 3.5217
Ans = 3.5 moles ...//
Answer:
2. B It is the outermost layer of Earth, composed of solid rock and divided into sections called plates. 3. B The inner core is kept solid by the intense pressure of all the layers above it.
Explanation: