Question

elements in the periodic table are arranged in many different ways. for example, vertical columns are called _. elements in groups have similar _ properties. we can read the periodic table by atomic number, atomic mass and chemical symbols directly. 108 hs 269 however, we can also read the properties of elements indirectly as well. some trends we can read include atomic radius, electronegativity, and ionization energy. atomic radius: the size of the atom we can measure the relative size of an element based on 2 main factors: the number of _ _ and the _ _. - the _ number also tells your how many energy levels the element has - as you go _ the periodic table, you increase the size - as you go _ the periodic table, you decrease the size - with more _ of electrons, you also increase the _ - this is when electrons push each other farther out - the higher the number of _ in a period, the more compact(smaller) the atom becomes - this increases as you go to the _ - if you go _, the looser the atom becomes and it gets bigger. in summary, if you go _ and _ of the periodic table, the larger the atom becomes. if you go _ and _, the smaller the atom becomes - _ is your largest atom and _ is your smallest atom

Explanation:

1. In the periodic table, vertical columns are called groups. Elements in the same group have similar chemical properties because they have the same number of valence electrons.
2. The relative size of an atom (atomic radius) is determined by the number of electron - shells and the nuclear charge. The atomic number indicates the number of energy levels. As you go down the periodic table (increasing the number of electron - shells), the atomic size increases. As you go across a period (from left to right), the atomic size decreases due to an increase in nuclear charge pulling the electrons in more tightly. More electron - shells lead to a larger atomic radius as electrons repel each other. A higher number of protons in a period makes the atom more compact. As you go to the left and down the periodic table, the atom becomes larger; as you go right and up, it becomes smaller. Francium (Fr) is one of the largest atoms and Hydrogen (H) is one of the smallest.

Answer:

1. groups; chemical
2. electron - shells; nuclear charge; atomic; down; across (left - to - right); shells; atomic radius; protons; left; down; down; left; up; right; Francium (Fr); Hydrogen (H)