An atom has 30 protons, 30 neutrons, and 30 electrons. What is the charge of the atom’s nucleus? A: +30
B: +60
C: -30
D: -90

+30

Explanation:

The nucleus holds both protons and neutrons. Since a neutron is neutral there is no charge. Protons are a positive charge. so the atoms nucleus is +30.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.