Chemistry
Across
- 2. The energy change that occurs when an electron is acquired by a neutral atom is called the atom’s electron affinity.
- 6. if two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers.
- 9. a chemical compound containing elements in exactly the same proportions by mass regardless of the size or source of the compound.
- 10. the attraction between two or more atoms that allows them to be able to form a stable chemical compound.
- 11. The first row of the f block are known as?
- 12. the p block includes all of the
- 14. has just three valence electrons, which tends to form bonds in which it is surrounded by six electrons.
- 17. two nuclei and two electrons _____ each other.
- 18. ______ is used to form chemical compounds.
- 20. Red Atoms of different elements combine are known as?
- 21. A ________ formula indicates the relative numbers of atoms of each kind in a chemical compound by using atomic symbols and numerical subscripts.
- 25. All matter is composed of extremely small particles called?
- 27. In the periodic table, the f-block elements are wedged between Groups 3 and 4 in the sixth and ______ periods.
- 28. The elements of Group 1 of the periodic table are known as the _____ metals.
- 30. Repeating patterns are referred to as ________.
- 31. is the energy required to break a chemical bond and form neutral isolated atoms.
Down
- 1. All six of the __________ are also in the p block.
- 3. is a unique element.
- 4. states that the physical and chemical properties of the elements are periodic functions of their atomic numbers.
- 5. Cationic and _______ radii decrease across a period.
- 7. electron of one atom and proton of the other atom _______ one another.
- 8. A ________ is a neutral group of atoms that are held together by covalent bonds.
- 13. A molecular formula shows the types and numbers of atoms combined in a single molecule of a molecular compound.
- 15. except hydrogen and ______.
- 16. is an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column, or group.
- 19. is a measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound.
- 22. The elements of Group 2 of the periodic table are called the alkaline-_____ metals.
- 23. A chemical compound whose simplest units are molecules is called a _________ compound.
- 24. The p-block elements together with the s-block elements are called the __________ elements.
- 26. Atoms cannot be __________, created, or destroyed.
- 29. The second row of the f block are known as?