The best way to do this is to google search each question, or look it up on quizlet.com
The answer is B, sodium is an element.
Answer: By performing the flame test
Explanation:
The flame test can be performed by the teacher to visually identify the substance in the solution. The metals give a characteristic color on burning. The heat of the flame causes the excitation of the electrons present in the metal ions this leads to release of energy along with the emission of visible wavelength of light. This visible light can be observed by human eye. For example, the copper produces the blue color in flame, barium gives green flame, and sodium gives yellow flame.
i think the greater the electric charge the atom decreases in size
To find the number of neutrons, subtract the number of protons from the mass number. number of neutrons=40−19=21.
