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Flashcards in Atoms Deck (19):
1

What is strong nuclear force?

Holds protons and neutrons in a nucleus together

2

Explain alpha decay

Two protons and two neutrons are emitted. The atomic number reduces by two and mass number reduces by 4. Elements change since atomic number is changing

3

Beta decay

Converts neutron to proton by weak nuclear force. Atomic number increases, mass number stays the same

4

Beta positive decay (positron emission)

Proton converted to neutron. Atomic number is one less and mass number remains the same

5

Electron capture

Electron captured from she'll and used to convert a proton to a neutron. Atomic number reduced and mass number stays the same

6

Gamma decay

Expulsion of energy after coming down from an excited state. No mass or atomic number change. Emits photon

7

What is half life?

Time it takes half substance to decay

8

What is limit to the Bohr model?

Cannot predict atomic spectra of many electron atoms, which is why quantum model was made

9

What are the four numbers for the quantum model?

Shell, subshell, orbital, and spin

10

What electrons have greater energy?

Those farthest outside

11

Three rules of electron configurations

Electrons occupy the lowest orbital possible, electrons in same subshell occupy orbitals singly (one spin up), no more than two electrons in any given orbital

12

Aufbau Principle

Electrons occupy lowest orbital possible first

13

Hunds rule

Electrons occupy subshell singly

14

Pauli exclusion principle

No more than two electrons in a given orbital

15

What does diamagnetic mean?

Atom has all electrons spin paired. There is an even number of electrons. There is no net magnetic field since spins cancel each other. Will be repelled by and external magnetic field

16

What is paramagnetic?

Odd number of electrons and all orbitals are not filled. Would be attracted to magnetic field

17

When counting d orbitals what must you do?

Subtract one from the period number

18

Isoelectronic

When two atoms have same configuration when one is an ion

19

What electrons does transition metals lose first?

S electrons before d electrons