What is the ph of the products that form when an acid reacts with an alkali

When an Acid reacts with an Alkali it forms a neutral products. Such as Water.
On the PH scale water is a mix between acid and alkali. So to answer your question, the PH would be 7. Always take a look at the PH scale if you’re not sure

They can measure  the amount of energy gained or lost

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts