Properties of Atoms

A chemist is identifying the elements present is a sample of seawater. What characteristic of an element's atoms always determines the element's identity?

• The location of valence electrons.

• The number of energy levels.

• The number of protons.

• The number of neutrons.

Four students were asked to name the part of an atom that determines it;s chemical properties. Which response is correct?

• Electron Cloud

• Valence Electrons

• Protons

• Neutrons

Which two elements have the same number of energy levels?

• Sn and Rb

• F and Cl

• K and Ba

• Se and Te

The periodic table is divided into groups and periods. The characteristics of one group is listed below...

is a solid at room temp

is shiny

has atoms with 2 valence electrons

Which of these elements is in this group?

• Strontium

• Aluminum

• Silicon

• Lithium

The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies the element and describes its reactivity?

• The element is sodium and it is highly reactive.

• The element is fluorine and it is not highly reactive.

• The element is sodium and it is not highly reactive.

• The element is fluorine and it is highly reactive.

Tags

NGSS.MS-PS1-1