Question

1. choose the best answer.

which of these produce the most vibrant colors when exposed to flame?
alkaline earth
alkali
transition

1. choose the best answer.

what is the total electron capacity for the 4th energy shell of an atom?
18
32
8
30

Explanation:

• Question 19: Alkali metals produce more vibrant colors in flame tests compared to alkaline earth metals. Transition metals generally do not show very vibrant colors in flame tests.
• Question 20: The formula to calculate the number of electrons in a shell is \(2n^{2}\), where \(n\) is the shell number. For the 4th shell (\(n = 4\)), \(2\times4^{2}=2\times16 = 32\).

Answer:

1. alkali
2. 32