Answer:
In these lessons, students become familiar with the four key periods of growth and human development: infancy (birth to 2 years old), early childhood (3 to 8 years old), middle childhood (9 to 11 years old), and adolescence (12 to 18 years old).
No it's not a proper solution to the world's problems
2+ charge = atom has lost 2 electrons
27+2=29
original atom has 29 electrons
Atomic # = 29
<u>Copper (Cu2+)</u>
hydrargyrum , hg swiftplanet, quicksliver
Explanation:
They are all in the same family, also known as a group. They're the same thing.