1. Name the elements with the following symbols a. Na
b. H
c. C
d. O

2. What is the symbol for the following elements?

a. Helium
b. Sulfur
c. Copper
d. Lead

Sarah wants to know where in her garden chamomile would grow the best. she thinks chamomile will grow best in the corner of the garden that gets the most sunlight. to test her hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. which of the following variables will sarah need to measure to know which group of plants grew best? a. the location of the plants b. the type of plants c. the height of the plants d. the amount of water she gives the plants

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope

The independent variable in an experiment will be the variable that you o a) change ob) hold constant ng c) observe for changes