A portion periodic table is shown below. Which elements are noble gases? oxygen,

Question

A portion periodic table is shown below. Which elements are noble gases? oxygen, fluorine, and neon sulfur, chlorine, and argon fluorine and chlorine neon and argon Why is the mass of a carbon atom greater than the total mass of its protons and electrons? The mass of a proton is greater than the mass of an electron. A proton is positively charged and an electron is negatively charged. Most of the atom's volume is the sphere-shaped cloud of electrons. The neutrons in the nucleus add mass to the atom. Elements that are gases at room temperature are likely to be classified as which of the following? metals nonmetals metalloids semiconductors Which property of aluminium makes it a suitable metal for soft-drink cans? It has good electrical conductivity. It can be hammered into a thin sheet (malleability). It can be drawn into long wires (ductility). It can reflect light (luster). Mendeleev's periodic table was a useful tool because it enabled him to observe the properties of undiscovered elements. construct the periodic table that is used today. make predictions about the properties of undiscovered elements. understand the structure of atoms. Which model of the atom is represented by the diagram below? the modern cloud model the Bohr model the Rutherford model the Thomson model

Explanation / Answer

1. Neon and Argon

He,Ne,Ar,Kr,Xe are noble gas elements

2. D.

3. B

All gases are non metals

4. B

5. A

6. D

plumb puding model

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