Calculate the average time the car took to reach each checkpoint. Record the average time in Table D of your Student Guide. The average time to the first quarter checkpoint is seconds. The average time to the second quarter checkpoint is seconds. The average time to the third quarter checkpoint is seconds. The average time to the finish line is seconds.

An observation that requires measurement is called quantitative observable or qualitative

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.