Constant. The concentrations must be constant and the rates must be equal.
The answer is 2 - Selenium
Answer:
it's A
Explanation:
The given element is, fluorine is a non-metal with symbol (F). It is a gas and belongs to the group 17 and period 2.
The atomic number of fluorine = 9
The number of electrons = 9
Cesium - although it is liquid at room temperature, metallic bonds can be seen.
A garduated cylander, in order to find the amount of water displaced you see how much the water has risen