Select all that apply. The following diagram shows the path of a planet around the Sun. Kepler discovered that
Time=t
P
-P3
Time=t
P,
Time=t
B
A
D
Ps
Time = 2t
6
20 pesqwere, no
area A = area B
the distance from P2 to P3 is half the distance from Pg to P6
the speed in the interval from P, to P2 is twice the speed in the interval from Po to P
the speed in the interval from P, to P2 is less than the speed in the interval from Pa to P4

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

The organism shown is a free-living one that is anchored to the bottom of ponds and streams during one stage of its life cycle what is the common name for the group to which this organism belong

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?