Atomic structure

Question 1

what is the relative charge of protons, electrons and neutrons?

Answer 1

1+, 1-, 0

Question 2

what is the relative mass of protons, electrons and neutrons?

Answer 2

1, 1/1840, 1

Question 2

what is a nucleon number?

Answer 2

the total number of protons and neutrons

Question 3

what is a characteristic of an atom?

Answer 3

they have the same number of protons and electrons, and hence are electrically neutral

Question 4

what are group 18 elements known as?

Answer 4

noble gases

Question 5

why are noble gases unreactive?

Answer 5

they have completely filled valence shells hence they do not gain, lose or share electrons to form molecules or compounds and exist as individual atoms

Question 5

what do metallic atoms form when they lose electrons?

Answer 5

positive ions (cations)

Question 6

what do non-metallic atoms form when they gain electrons?

Answer 6

negative ions (anions)

Question 6

what is the definition of isotopes?

Answer 6

Isotopes are atoms of the same element with the same number of protons but different number of neutrons

Question 6

what is the arrangement of electrons in an atom?

Answer 6

2 electrons in the first shell, 8 electrons from the second shell onwards

Question 7

why do some ionic compounds end with -ide while others end with -ate

Answer 7

ionic compounds that end with -ide are non-metallic while those that end with -ate are metallic atoms