Science
Subdecks (4)
Cards (261)
- An atom has two distinct regions, which is?
- It is at the center of the atom and is described to be very tiny, dense, and positively charged?
- This is where the protons and neutrons are concentrated?
- This is the positively charged subatomic particle?
- This is the negatively charged subatomic particle?
- The proton and electron have the same _____but opposite in sign?
- This has zero charge for both unit and coulomb charge?
- In terms of mass, the lightest subatomic particle is the?
- They have higher masses compared with that of the electron and since both subatomic particles in the nucleus, this would explain the massive and dense property of nucleus?
- The atomic number is equal to the number of?
- For a neutral atom, the number of protons is also equal to the number of?
- Refers to the total number of protons and neutrons in the nucleus of the atom?
- The elements are generally represented by a ____ showing the symbol of the element, the atomic number and mass number?
- It is formed by the loss or gain of electrons?
- When an atom loses electron/s, a _____ is formed with a positive charge?
- When an atom gains electron/s, an ____ is formed with a negative charge?
- 1862 He grouped the elements in threes and Calculated the atomic mass of the middle element. Consider Ca, Sr, and Ba: Calcium (Ca) with atomic mass of 40 and Barium (Ba) with the atomic mass of 137. The average of the two is equal to 88 which is the atomic mass of Strontium (Sr); the element between the two. This is the Law of Triads.?
- 1862 He prepared a helical graph containing a list of all known elements at that time wrapped around a cylinder. The elements with similar properties fall under the same column.?
- 1863 He arranged the elements according to increasing atomic weights and observed that the properties of the elements are repeated after an interval of eight elements. Hence, he proposed the idea of periodicity among the elements. He later wrote a paper proposing the Law of Octaves ?
- 1864 He arranged the elements according to atomic weights and was able to arrange 26 elements based on similar properties into 6 groups or families?
- 1869 He arranged the elements in increasing atomic mass. His periodic table originally consisted of 17 columns. In 1871, he revised it into 8 columns with the transition metals occupying the 8th column. Similar result with Lothar Meyer.?
- 1894 discovered the noble/inert gases whose properties did not fit all the other elements. It was him who first discovered argon?
- 1894 He followed the discovery of Lord Rayleigh and discovered the other inert gases and placed them in the periodic table?
- 1913 He arranged the elements in the periodic table according to increasing atomic number. This arrangement eliminated some of the inconsistencies in the work of Mendeleev. The modern periodic table is based on his work.?
- 1944 He discovered the transuranium elements with atomic numbers 92-102 He also added. the lanthanide and actinide series projected perpendicular to the plane of the periodic table.?
- The modern periodic table have ______ arranged according to increasing atomic number?
- The vertical column in the periodic table is referred to as?
- The groups are labeled _____ and _______?
- Group A are called the?
- Group B are called the?
- These are the horizontal rows in the Periodic Table?
- Indicates the highest energy level where the outermost electrons are located?
- Group 1A are the?
- Group 2A are the?
- Group 3A are the?
- Group 4A are the?
- Group 5A are the?
- Group 6A are the?
- Group 7A are the?
- Group 8A are the?