From the choices below, select the element that has 2 valence electrons, more than 30 neutrons but less than 70 neutrons. *
strontium (SI)
barium (Ba)
calcium (Ca)
rubidium (RD)

he would use the colour black

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.