How are electrons arranged in elements with atomic numbers 1 through 10?

See explanation

Explanation:

For elements with atomic numbers 1-10, the arrangement of electrons is as follows; 1s 2s 2p.

These elements are found in the second period that commences at lithium and ends in neon.

The ten electrons that may be found in the atoms of these elements are arranged in orbitals as shown above.

c is the answer because when something is left after something evaporates that shows the chemical change.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.