Intro to atomic structure

Question 1

What does the nucleus of an atom contain

Answer 1

Positively charged protons with weight of 1 and neutrons which don’t carry charge and contain a weight of 1

Question 2

What do the outer shells of atoms contain

Answer 2

Negatively charged electrons

Question 3

What are isotopes and what characteristic do they have

Answer 3

They have the same number of protons and different neutrons

Question 4

What are ionic bonds

Answer 4

Involves the transfer of electron, one or more electrons are transferred from one atom to another. Atom that donates becomes a + ion, atom that accepts - ion. Occurs between metals and non metals

Question 5

In the reaction N2+ 3H2→ 2NH3, if you have 4 moles of H2, how many moles of NH3 can be produced?

Answer 5

According to the molar ratio (3 moles of H2 produce 2 moles of NH3), 4 moles H2 ×. 2 moles NH3/ 3moles H2 =2.67 moles of NH3

Question 6

what are isotopes

Answer 6

They have the same number of protons but diffrent neutrons

Question 7

Covalent bonds

Answer 7

Sharing of electrons with the aim of a stable outer shell. They are formed between non metals. Covalent compounds can’t conduct electricity because all e- are paired or involved in bond formation