A necklace is to be created that contains only square shapes, circular shapes, and triangular
shapes. A total of 180 of these shapes will be 1
square, 1 circle, 1 triangle, 2 squares, 2 circles, 2
triangles, 3 squares, 3 circles, 3 triangles, with
the number of each shape type increasing by one
every time a new group of shapes is placed. The
diagram illustrates how the first 18 shapes would
be strung. Once the necklace is completed, how
many of each shape would the necklace contain?

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

step-by-step explanation:

the triangles are similar. therefore the corresponding sides are in proportion:

              cross multiply

            divide both sides by 32

step-by-step explanation:

for exempl this   system of equations   y = x - 3

                                                                y = 2x - 5

look   the line : y = x -3     ( red)

                            the line : y = 2x -5 ( bleus)