Which two elements have similar properties and 8 electrons in their outermost shells? A. Arsenic and Antimony
B. Sodium and Potassium
C. Iodine and Bromine
D. Krypton and Xenon

Its D Kr and Xe

Explanation:

Element from the same group have simmilar properties

If you now the atomic number ،its so easy to know how much electrons they have in outermost shell.

trig 15.3 cos

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.