Why is chemistry often called a central science?

Which Lewis description is appropriate for O2?

How many valence electrons does an atom of arsenic (As) have?

A white crystalline substance has: a high melting point conducts electricity when melted shatters when struck consists of a repeating arrangement of charged particles Which of the following represents the most reasonable conclusion?  

Which electrons most directly influence an element’s chemical behavior?

Which of the following reflects the correct formula for that element when it forms a stable ion? P3- Na- O2+ Ca+

Which of the following is NOT one of the six chemical elements most commonly found in build biological molecules?

ANSWER AND EXPLAIN QUESTION A central atom is double-bonded to two atoms and has one set of lone pairs. What is the molecular geometry around the central atom? (Ignore any violations of the octet “rule” for this problem). Linear Bent Trigonal planar Trigonal pyramidal Tetrahedral Type the letter of your answer choice in the space provided.  Verbally explain your reasoning out loud as if you are tutoring another student (this will be recorded in your Honorlock video). Your explanation should make it clear how you determined your answer. You may also type your explanation in case your explanation does not get adequately recorded. Question will be assessed for accuracy (choosing correct answer) AND explanation.  Responses that only state the answer or give a vague explanation will not receive full credit.

Mercury is a heavy, silvery metal. It forms alloys called amalgams with other metals, such as gold and silver. Compared to other metals, it is a poor conductor of heat, but a fair conductor of electricity.  It does not react with most acids but even small amounts can corrode aluminum. Mercury is extremely volatile and also quite toxic. Its melting point is -39ºC, thus it is a liquid at room temperature.  Which of the following lists reflect physical properties of mercury taken from the provided description?

What is the approximate ideal bond angle in a tetrahedral molecule?