Answer:
B Fluorine is the most reactive because it has 7 electrons in the outer shell.
Explanation:
The valid conclusion about the reactivity of the elements is that fluorine is the most reactive because it has 7 electrons in the outer shell.
- Reactivity of elements is in a bid to attain a stable configuration of their atoms.
- Fluorine belongs to group 7 on the periodic table.
- To complete its octet, it requires just one electron.
- This makes it very reactive
- On getting an electron, it becomes like the nearest noble gas, Neon.
Centaurus because it also has ten of the most brightest stars
Answer:
When you move the burette slider to the top of a flask and add about 25 mL of NaOH to the flask, you will cause a concentration of OH- molecules. This will make the solution become a basic solution and make the litmus paper blue.
Explanation:
After reading your question, we can see that you are carrying out a test to discover the nature of the pH of a solution. This type of test uses litmus paper, which is an indicator of the presence of acids and bases, being able to determine the pH of a solution. This paper is soaked in organic ink and when placed in an acidic solution, it is red in color. However, when placed in a basic solution it has a blue color.
An acidic solution is one that has a high concentration of H+ atoms and has the ability to donate electrons. The basic solution, on the other hand, has a high concentration of OH- and has the capacity to receive electrons.
When you move the burette slider to the top of a flask and add about 25 mL of NaOH to the flask, you will cause a concentration of OH- molecules. This will make the solution become a basic solution and make the litmus paper blue, that is, the solution has the basic pH.
Answer and hopefully this helps.