One common chemistry assignment is to name or even memorize the first 20 elements and their symbols.The elements are ordered in the periodic table according to increasing atomic number. This is also the number of protons in each atom.Answer: These are the first 20 elements, listed in order:1 - H-Hydrogen.ne common chemistry assignment is to name or even memorize the first 20 elements and their symbols.
http://chemistry.about.com/od/periodictableelements/f/What-Are-The-First-20-Elements.htm
The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons in the nucleus), electron configurations, and recurring chemical properties. The table also shows four rectangular blocks: s-, p-d- and f-block.he periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons in the nucleus), electron configurations, and recurring chemical properties. The table also shows four rectangular blocks: s-, p-d- and f-block.
https://en.wikipedia.org/wiki/Periodic_table
Electron arrangement of the first 20 elements. Electrons are arranged in shells at different distances around the nucleus. As we move across each row of the Periodic Table the proton number increases by one for each element.This means the number of electrons also increases by one for each element.hen this is filled, electrons go into the third shell, which also holds a maximum of eight electrons. Then the fourth shell begins to fill. The table shows the number of electrons in each shell for the first 20 elements in the Periodic Table.
http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/periodic_table/electronsrev1.shtml
The modern periodic table has changed since Mendeleev's original table, yet both the first tables and the modern table are important for the same reason: The periodic table organizes elements according to similar properties so you can tell the characteristics of an element just by looking at its position on the table.lements in the same column as each other (groups) share similar properties. For example, the elements in the first column (the alkali metals) are all metals that usually carry a 1+ charge in reactions, react vigorously with water, and combine readily with nonmetals.
http://chemistry.about.com/od/periodictableelements/fl/Why-Is-the-Periodic-Table-Important.htm
The periodic table is an arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations and recurring chemical properties.Elements are presented in order of increasing atomic number.he periodic table is an arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations and recurring chemical properties.
https://en.wikipedia.org/wiki/History_of_the_periodic_table
• Organize the first 18 elements of the periodic table according to their atomic mass, number of electron shells, and valence electrons, then compare their order within the periodic table.• Identify common physical properties and uses of elements within a family. Organize the first 18 elements of the periodic table according to their atomic mass, number of electron shells, and valence electrons, then compare their order within the periodic table.
http://school.discoveryeducation.com/lessonplans/pdf/ec_periodictable/ec_periodictable.pdf
1 The table can be used to predict properties of elements, even those that have not been discovered. 2  Columns (groups) and rows (periods) indicate elements that share similar characteristics. 3  The table makes trends in element properties apparent. 4  The table provides important information used to balance chemical equations.lements in the same column as each other (groups) share similar properties. For example, the elements in the first column (the alkali metals) are all metals that usually carry a 1+ charge in reactions, react vigorously with water, and combine readily with nonmetals.
http://chemistry.about.com/od/periodictableelements/fl/Why-Is-the-Periodic-Table-Important.htm
The number of protons in the atom of an element determines its place in the Periodic Table. The number of electrons in an atom is the same as the number of protons. These electrons are arranged in shells or 'energy levels' around the nucleus.The arrangement of electrons determines the chemical properties of an element.hen this is filled, electrons go into the third shell, which also holds a maximum of eight electrons. Then the fourth shell begins to fill. The table shows the number of electrons in each shell for the first 20 elements in the Periodic Table.
http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/periodic_table/electronsrev1.shtml
The periodic table contains an enormous amount of important information: Atomic Number: The number of protons in an atom defines what element it is. For example, carbon atoms have six protons, hydrogen atoms have one, and oxygen atoms have eight.he periodic table contains an enormous amount of important information: Atomic Number: The number of protons in an atom defines what element it is. For example, carbon atoms have six protons, hydrogen atoms have one, and oxygen atoms have eight.
http://www.livescience.com/25300-periodic-table.html
Elements in the same column as each other (groups) share similar properties. For example, the elements in the first column (the alkali metals) are all metals that usually carry a 1+ charge in reactions, react vigorously with water, and combine readily with nonmetals.Elements in the same row as each other (periods) share highest unexcited electron energy level.lements in the same column as each other (groups) share similar properties. For example, the elements in the first column (the alkali metals) are all metals that usually carry a 1+ charge in reactions, react vigorously with water, and combine readily with nonmetals.
http://chemistry.about.com/od/periodictableelements/fl/Why-Is-the-Periodic-Table-Important.htm
why are the first 20 elements important to the periodic table
The Electron arrangement of the first 20 elements and Electrons are arranged in shells at different distances around the nucleus.