4.3 questions

Question 1

why is the shell closest to the nucleus filled with electrons first

Answer 1

the shell closest to the nucleus is the lowest energy level.

electrons will always occupy the lowest energy level that is available.

Question 2

what element has the configuration
2.8.1

Answer 2

sodium (Na)

Question 3

what element has the configuration
1

Answer 3

hydrogen (H)

Question 4

what element has the configuration
2.7

Answer 4

fluorine (F)

Question 5

what element has the configuration
2.8.8

Answer 5

argon (Ar)

Question 6

the electronic configuration of carbon is 2.4, list all the information you can determine from this

Answer 6

• carbon has 6 electrons and 6 protons
• in period 2
• in group 14
• has 4 valence electrons
• 2 electron shells

Question 7

compare the number of protons and electrons in an uncharged atom with those in an ion

Answer 7

in an uncharged atom, the number of protons and electrons is the same

Question 8

why is group 18 unreactive

Answer 8

because they have a full valence shell

Question 9

what is the difference between valence electrons and other electrons in an atom

Answer 9

valence electrons are in the outermost shell of an atom (the highest energy level)

Question 10

why do elements in the same group have similar properties

Answer 10

they all have the same number of valence electrons so they are all equally as eager to get the other valence electron/s.

Question 11

what is the lowest energy level called

Answer 11

this is called ground state

Question 12

in a cation is there more electrons or protons

Answer 12

protons

Question 13

in an anion is there more electrons or protons

Answer 13

electrons

Question 14

what electron shell is involved in chemical bonding

Answer 14

valence electrons are involved in chemical bonding with other elements to form compounds