Question

1- an atom has the following chemical symbol: 114Cd

a- how many protons does this atom have?

b- how many neutrons does this atom have?

c- how many electrons does this atom have?

2- an ion has 33 protons, 41 neutrons, and 36 electrons

a- what is the mass number of this atom?

b- what is the symbol for this ion? enter both mass and the atomic number

3- which of these ions has the same number of electrons as an atom of krypton?

a- As2-

b- Ca2+

c- Se2-

d- K+

4- rank the following isotope in order of increasing number of neutrons

oxygen-18

nitrogen-14

carbon-12

carbon-14

fluorine-18

Answer 1

1)

a)

Atomic number of Cd = 48

So,

number of protons = 48

Answer: 48

b)

mass number given in question = 114

Use:

number of neutrons = mass number - atomic number

= 114 - 48

= 66

Answer: 66

c)

Since Cd is neutral. There is no charge on it

So,

number of electrons = number of protons

= 48

Answer: 48

Only 1 question at a time please