Unit 3.15 Physical Science

The periodic table was created by grouping elements according to their properties. Oxygen is a gas that has 6 valence electrons and is colorless. Which of the following unknown element would be grouped along with it?

• Boron

• Selenium

• Aluminum

• Phosphorous

Which list of elements is arranged in order of increasing atomic number?

• Sr, Ca, Mg, Be

• Sc, V, Ti, Cr

• B, C, Li, Be

• F, Cl, Br, I

Which of these elements has physical and chemical properties most similar to Arsenic (As)?

• Germanium (Ge)

• Phosphorus (P)

• Silicon (Si)

• Lead (Pb)

Which subatomic particle is not part of the nucleus of an atom?

• Neutron

• Proton

• Electron

• Isotope

Using the periodic trend diagram above and the periodic table provided, identify which one of the properties potassium (K) has that is a larger value than the same property for lithium (Li)?

• Atomic radius

• Electron affinity

• Ionization energy

• Nonmetallic character

Tags

NGSS.HS-PS1-1

Why were there blank spaces left in Mendeleev's periodic table?

• He didn't know what to put there.

• He predicted undiscovered elements not yet known.

• Multiple elements could have fit in those spaces.

• He forgot to add the elements in.

In the modern periodic table elements are arranged by

• Atomic mass

• Atomic number

• Valence electrons

• Number of isotopes

Who developed the first periodic table and arranged the elements in order of increasing atomic mass?

• Chadwick

• Rutherford

• Mendeleev

• Mosely

Which of the following models of an atom is most widely accepted as correct?

• Bohr model

• Electron Cloud model

• Plum Pudding model

• Radioactive model

Moseley discovered that the _______ was the most fundamental property needed for the organization.

• Atomic mass

• Number of neutrons

• Atomic number

• Number of protons