A. how do the numbers of protons in different isotopes of an element compare?

b. how do the number of neutrons in different isotopes of an element compare?

c. what is the atomic number of an atom, and where can you find it on the periodic table?

d. how many protons, neutrons and electrons does a neutral atom of iron-55 have?

​15. Metallic bonds form between?

Answer 15 : cations and electrons.​

​16. What is the formula for lithium nitride?

​Answer 16 : Li₃N

​17. Which type of solid is likely to be the best conductor of electricity?

​Answer 18 : metal element.

​18. When an atom gains an electron, it forms a?

​Answer 18 : an anion.

​19. Mg₃P₂ - Which element is the cation?

Answer 19 : Mg⁺⁺​

20. Which of the following has the highest melting point? ​

​Answer 20 : metallic compound.

21. What statement is true about carbon-12 and carbon-14?​

​Answer 21 : They are isotopes of carbon.

​22. What is the name of the phase change that occurs when a substance changes from a gas to a liquid?

​Answer 22 : Condensation

​Hope this helps!

​​

i believe the answer is "Different isotopes for the same element always have the same number of protons". just took the test

a. d.

Explanation:

isotopes have a diff number of neutrons

14 needs 2

15 cations and electrons

16 LI3N

17 metal element

18 anion

19 Mg

20 metallic

21 they are isotopes of carbon

22 condensation

hope this helps

The correct statement is isotopes of a given element have very similar chemical properties.

Explanation:

Isotopes are defined as the species which have same atomic number. They are defined as the substances which have same number of protons but have different number of neutrons.

As, these species have same atomic number. So, they have same number of protons and electrons.

And the species which have same number of electrons will show similar chemical properties.

Thus, the correct statement is isotopes of a given element have very similar chemical properties.

a) Protons define an element, so all isotopes have the same number of protons.

b) And what really differs is a number of neutrons.

c) The atomic number equals number of electrons or positrons and is written on the left side below the atom.

d) 26 protons & electrons, 29 neutrons.

a) Protons define an element, so all isotopes have the same number of protons.

b) And what really differs is a number of neutrons.

c) The atomic number equals number of electrons or positrons and is written on the left side below the atom.

d) 26 protons & electrons, 29 neutrons.

PART A)

In isotopes number of protons will be same in two.

So there is no difference in number of protons

PART B)

Number of neutrons will be different in two isotopes

it may be greater or less than by one

So two isotopes are of different number of neutrons

PART C)

Atomic number of atom is written in subscript of an atom

It is written below the atom

It shows the total number of protons or electrons in an atom

in this presentation z = number of protons

PART D)

iron-55 shows that it has number of protons + neutron = 55

As we know that atomic number of iron is 26

so number of protons = 26

now number of neutrons = 55 - 26 = 29

number of electrons = number of protons = 26

PART A)

In isotopes number of protons will be same in two.

So there is no difference in number of protons

PART B)

Number of neutrons will be different in two isotopes

it may be greater or less than by one

So two isotopes are of different number of neutrons

PART C)

Atomic number of atom is written in subscript of an atom

It is written below the atom

It shows the total number of protons or electrons in an atom

in this presentation z = number of protons

PART D)

iron-55 shows that it has number of protons + neutron = 55

As we know that atomic number of iron is 26

so number of protons = 26

now number of neutrons = 55 - 26 = 29

number of electrons = number of protons = 26