Question 1
elements in the same period have the same

valence electron
electrons
atomic number
valence shell number

question 2
which element has the greatest reactivity? (refer to a periodic table)

phosphorous (p)
chlorine (cl)
sodium (na)
lithium (li)

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).

When sodium chloride dissolves in water the sodium cholride dissociates into?

The changes that the students observed, rapid breathing and sweating, would be classified as a to a change in a system.