Answer:
Option 2, 3, and also 6 btw
Explanation:
The other guy was wrong
Bonjeur monseur, la french are here! it seems you have a problem with the elements on earth. lead seems correct since it is indeed a harmful material
the density of a black hole is 22.61 g/cm3 i think
Ans: Have the same number of electron shells
As the atomic radius decreases, it becomes harder to remove an electron that is closer to a more positively charged nucleus. ... They experience a weaker attraction to the positive charge of the nucleus. Ionization energy increases from left to right in a period and decreases from top to bottom in a group.
