Answer:
Rubidium
Rubidium is the first element placed in period 5.
Answer: look at the close because that is the answer
Explanation:
Noble gases react very unwillingly, because the outermost shell of electrons orbiting the nucleus is full, giving these gases no incentive to swap electrons with other elements. As a result, there are very few compounds made with noble gases. Like its noble gas comrades, neon is odorless and colorless.
