1. Mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. 2. It is a poor conductor of heat, but a fair conductor of electricity. 3. Mercury does not react with most acids, such as dilute sulfuric acid, although oxidizing acids such as concentrated sulfuric acid and nitric acid or aqua regia dissolve it to give sulfate, nitrate, and chloride. 4. Mercury dissolves many other metals such as gold and silver to form amalgams. 5. It has a freezing point of −38.83 °C and a boiling point of 356.73 °C. Hope these 5 properties are enough :)
Answer:
The correct answer is option A, that is, one valence electron in its third energy shell and option C, that is, 11 electrons and 11 protons.
Explanation:
The outermost electrons and the ones that take part in the process of bonding are termed as valence electrons. The atomic number of sodium is 11, thus, it possesses 11 protons and the atoms are neutral so it suggests that sodium has 11 electrons. By electronic configuration, it can be seen that in sodium, two electrons are present in the first shell, 8 in the second, and only one electron in the third shell, that is, 2.8.1. The electron present in the third shell is the valence electron.
Answer:
group d
Explanation: because it goes back the most amount of years