|UPDATED| ACS Chemistry Final Exam |Question and Answer| 2024/2025

|UPDATED| ACS Chemistry Final Exam |Question and Answer| 2024/2025 Layout of an element (mass # & atomic #) *Ans* atomic number = *Ans* # of protons mass number = *Ans* # of protons + neutrons the number of protons in a neutral atom will equal the *Ans* # of electrons how to find the correct number of neutrons *Ans* mass number - atomic number Forms of the same elements that differ in amount of neutrons *Ans* isotopes What particle, if lost from the nucleus, would NOT cause a change in the atomic number? *Ans* a neutron because it has no charge When alpha particles were shot at a metal foil target, most passed through without deflections, while others deflected at large angles. What did this suggest to Rutherford? *Ans* that the atoms of the metal were mostly empty space, while the nucleus consisted of most of the mass which included highly condensed positive particles (which caused the deflection). An atom has a valence shell configuration of 1s1. To which group of elements on the periodic table does it belong? *Ans* IA alkali metals electromagnetic spectrum *Ans* The greater the wavelength of a photon..? *Ans* the lower its frequency The greater the frequency of a photon...? *Ans* the shorter its wavelength Light energy formula *Ans* What does C in the light energy formula represent? *Ans* Give the ground-state electron configuration of an atom in the second period *Ans* 1s2 2s1 Electrons configuration rule that states electrons do not pair until they have to. (put one electrons in each electron domain then pair up) *Ans* Hund's rule