Correct answer: 18
The outermost shell is full when that shell reaches 2(n²) electrons distributed by holding-capacity of each layer, where n is the outermost shell number. The element with an atomic number of 18 has 18 electrons around it. For the first shell, it is full when it has two electrons [2(1²)= 2 on the first shell]. The second shell is full when it has six electrons [2(2²)= 2 on the first shell + 6 on the second]. The third shell is full when it has 8 electrons [2(3²)= 2 on the first shell + 6 on the second + 8 on the third shell]. 18 electrons fill up the outermost shell of the element.
I think the correct answers are A and B
The answer is that 200 ewwuals ano
Answer:
a) gold - Solid
b) gasoline - liquid
c) oxygen - gaseous
d) olive oil - liquid
e) mercury (found in thermometers) - liquid
f) aluminum - solid
Explanation:
Matter exists in three states viz: solid, gas and liquid. Note that, room temperature is a neither hot or cold temperature, which is about 20-23°C.
A) Gold is a transition metal with the symbol Au. At a room temperature, Gold, like most metals are found as SOLIDS.
B) Gasoline is a liquid mixture of refined hydrocarbons majorly used as fuels.
C) Oxygen is a chemical element with symbol O. It is a constituent of natural air, which is a mixture of different gases including oxygen. Hence, at room temperature, Oxygen is a gas.
D) Olive oil is a vegetable oil got from olives. It is composed of fats and it's a liquid at room temperature.
E) Mercury is an element with symbol Hg. It is the only metallic element found naturally (at room temperature) as a liquid. It is used in thermometers.
F) Aluminum is another chemical element with symbol Al. It is a lustrous metal that occurs as a Solid in room temperature.