The Atom and the Periodic Table

How many protons and neutrons are in one atom of Si-30

• 14 protons and 14 neutrons

• 14 protons and 16 neutrons

• 16 protons and 14 neutrons

• 16 protons and 16 neutrons

Tags

NGSS.MS-PS1-1

What is the average atomic mass of neon?

Ne-20 (90.48%), Ne-21(.27%), Ne-22 (9.25%)

• 10.50 amu

• 20.19 amu

• 21.00

• 2018.77 amu

Which of the following showed electrons in specific, fixed orbits?

• Rutherford Model

• Planck Model

• Bohr Model

• Quantum Model

The alpha particles in Rutherford's experiments were used to---

• identify chemical properties

• identify the melting point

• determine molecular mass

• bombard sheets of gold

Which of the following statements is most accurate regarding atoms?

• most atoms cannot combine with other atoms

• chemical reactions divide atoms into smaller units

• atoms of the same element may have different mass numbers

• atoms only contain protons

Tags

NGSS.HS-PS1-7

Which of these elements is the most electronegative?

• argon

• chlorine

• phosporus

• sulfur

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element has the largest atomic radius?

• Berylium

• Francium

• Polonium

• Chlorine

Which of these elements has the largest atomic radius?

• Calcium

• Sodium

• Potassium

• Magnesium

Which of the following atoms has the largest radius?

• F

• Cl

• Br

• I

Which of the statements below accurately describes the trends of electronegativity in the Periodic table?

• Electronegativity increases from right to left across the period.

• Electronegativitey increases from top to bottom in a group.

• Electronegativity decreases from left to right across a period

• Electronegativity increases from bottom to top in a group