1.2 - 1.5 atomic structure (chapter one)

Question 1

What did Dalton contribute to the atomic structure

Answer 1

the smallest particle is an atom and atom’s can’t be created or destroyed

Question 2

What did Thomson contribute to the atomic structure?

Answer 2

proposed that an electron is negative

Question 3

What did Rutherford contribute to the atomic structure?

Answer 3

proposed that nucleus is made up o positively charged particles : protons, and the nuclear model

Question 4

Chadwick

Answer 4

confirmed nucleus has neutrons and protons

Question 5

Bohr

Answer 5

proposed that electrons exist around nucleus in energy levels

Question 6

Atomic Number

Answer 6

represents that protons equal electrons because everything in the periodic table is neutral

Question 7

Mass Number

Answer 7

sum of protons and neutrons in nucleus

Question 8

cations

Answer 8

ions that have gained a positive charge (metals) (same name)

Question 9

anions

Answer 9

ions that have gained a negative charge (non-metals) (-ide)

Question 10

multivalent elements

Answer 10

can form more than one stable ion

Question 11

isoelectronic

Answer 11

same # of electrons

Question 12

isotopes

Answer 12

different number neutrons, same number of protons and electrons

Question 13

atomic mass

Answer 13

weighted average of the mass of all its isotopes

Question 14

how does atomic radius change from top to bottom

Answer 14

it increases as it goes down

Question 15

chemical reaction indication

Answer 15

color change, absorption or release of energy, formation of gas/precipitate

Question 16

Radio-isotopes

Answer 16

isotopes that produce nuclear radiation