Question

3. Alisha has three roll of streamers to use in
decorating the school gym for a dance
competition. The red roll is 42 m long, yellow
roll is 49 m long and the green roll is 63 m
long. She wants to cut the roll into strips of equal
length and have no material left over. What is
the greatest length of each strip?​

Answer 1

Step-by-step explanation:

Atomic number (Z)=15=P→[Ne]3s

2

3p

3

Phosphorus belongs to 15th group

number of valence electrons 3s

2

3p

3

=5

and valency =3 in ground state.

Hence, the correct option is C