C4 The Periodic Table Flashcards
How is the modern periodic table ordered 📑?
By atomic number
How were the early 🕒 lists of elements ordered 📑?
By atomic mass
Y Did Mendeleev swap the order of some elements?
To group them by their chemical properties
Y did Mendeleev leave 🍂 gaps in his periodic table?
Leave room for elements that had not yet been🍯 💿 discovered
Y do elements in a group 👥 have similar chemical properties?
They have the same amount of electrons in their outer shell 🐌
Where r metals 🤘 and non-metals 🤘 located on The Periodic table?
Metals to the left 👈 and non metals to the right 👉
Name of group 1 elements?
Alkali metals 🤘
Y r the alkali metals named the alkali metals?
They r metals 🤘 that react with water to form an alkali
Give the general equations for the reactions of alkali metals 🤘 with oxygen, chlorine and water
Metal + Oxygen ➡️ Metal Oxide
Metal + Chlorine ➡️ Metal Chloride
Metal + Water 🌊 ➡️ Metal Hydroxide
Y does the reactivity of the alkali metals 🤘 Increase down the group ?
They r larger atoms, so the outermost electron is further from the nucleus, meaning there r weaker electrostatic forces of attraction and more shielding between the nucleus and outer electron, and it is easier to lose the electron
What name is given to the Group 7 elements?
Halogens
How do the melting points of the halogens change down the group?
Increase (higher melting point)
Y does the reactivity of the halogens decrease as u go down the group?
They r larger atoms, so the outermost shell 🐌 is further from the nucleus, meaning there r weaker electrostatic forces of attraction and more shielding between the nucleus and outer shell and it is harder to gain an electron
Displacement reaction?
When a more reactive element takes the place of a less reactive one in a compound
What name is given to the Group 0 elements?
Noble Gases 😤
