How many ions that have a +1 charge will bond with an ion that has a –2 charge? one two three four

Two ions.

When bonding, the ions want to bind in a way that the positive and negative charges add up to 0.

If one ion has a -2 charge, TWO 1+ ions are needed to balance it out.

Hope this helps!

The answer is b on plato.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later