element 1(neutral) has 4 electrons and 5 neutrons
element 2 (neutral) has 4 protons and 6 neutrons
What are isotopes of Beryllium?
200
mass number of Boron
What is 11?
200
potassium, rubidium and cesium are members of this family
What is alkali metal family?
300
Planetary model with electrons orbiting in energy levels around a positively charged nuclues.
What is Bohr's atomic model?
300
Has 9 protons and 10 neutrons
What is Flourine?
300
element 1: mass number of 40 with 20 electrons in a neutral atom
element 2: mass number of 44 with 21 electrons in a neutral atom
What are different elements (Calcium and Scandium)?
300
Number of electrons in a neutral atom of Xenon
What is 54?
300
The actinide series belongs to this period.
What is 7th period?
400
Modern shows areas where the electrons are most likely to be found surrounding the nucleus.
What is the electron cloud model?
400
Has 1 proton and 2 neutrons
What is an isotope of hydrogen (H-2)?
400
Element 1: 5 protons
Element 2: neutral atom 5 electrons
Element 3: Atomic mass of 10.81
Element 4: Atomic number of 5
Element 5: Atomic mass number of 11
What is element of Boron?
400
Number of neutrons in an atom of Scandium?
What is 24?
400
This group of elements are stable or non-reactive,
What are the noble gasses or group 8A elements?
500
Dense positively charged nucelus with electrons orbiting outside the nucleus but the specific location was not defined.
What is Rutherford's atomic model?
500
Has an average atomic mass (weighted average atomic mass) of 22.990>
What is sodium?
500
Element 1: atomic mass of 39.098
Element 2: atomic mass of 39.948
What are different elements (Argon and Potassium)?
500
number of neturons in Lithium-9 or Li-9
What is 6?
500
This element is stable or non-reactive even though it only has 2 valence electrons.